Backport SmartSAF enable and Scale NHG for DT2 HWSKU (sonic-net#1769)

Changes missing from msft_202503:
sonic-net#23908
sonic-net#23722

Was already added for Arista-7060X6-64PE-B-O128 in
Azure/sonic-buildimage-msft#1674

<!--
Please make sure you've read and understood our contributing guidelines:
     https://github.com/Azure/SONiC/blob/gh-pages/CONTRIBUTING.md

** Make sure all your commits include a signature generated with `git
commit -s` **

If this is a bug fix, make sure your description includes "fixes #xxxx",
or
     "closes #xxxx" or "resolves #xxxx"

     Please provide the following information:
-->

#### Why I did it

##### Work item tracking
- Microsoft ADO **(number only)**:

#### How I did it

#### How to verify it

<!--
If PR needs to be backported, then the PR must be tested against the
base branch and the earliest backport release branch and provide tested
image version on these two branches. For example, if the PR is requested
for master, 202211 and 202012, then the requester needs to provide test
results on master and 202012.
-->

#### Which release branch to backport (provide reason below if selected)

<!--
- Note we only backport fixes to a release branch, *not* features!
- Please also provide a reason for the backporting below.
- e.g.
- [x] 202006
-->

- [ ] 201811
- [ ] 201911
- [ ] 202006
- [ ] 202012
- [ ] 202106
- [ ] 202111
- [ ] 202205
- [ ] 202211

#### Tested branch (Please provide the tested image version)

<!--
- Please provide tested image version
- e.g.
- [x] 20201231.100
-->

- [ ] <!-- image version 1 -->
- [ ] <!-- image version 2 -->

#### Description for the changelog
<!--
Write a short (one line) summary that describes the changes in this
pull request for inclusion in the changelog:
-->

<!--
Ensure to add label/tag for the feature raised. example - PR#2174 under
sonic-utilities repo. where, Generic Config and Update feature has been
labelled as GCU.
-->

#### Link to config_db schema for YANG module changes
<!--
Provide a link to config_db schema for the table for which YANG model
is defined
Link should point to correct section on
https://github.com/Azure/sonic-buildimage/blob/master/src/sonic-yang-models/doc/Configuration.md
-->

#### A picture of a cute animal (not mandatory but encouraged)

Author: bingwang-ms

device/arista/x86_64-arista_7060x6_64pe_b/Arista-7060X6-64PE-B-P28O72/sai.profile

@@ -1,2 +1,3 @@
 SAI_INIT_CONFIG_FILE=/usr/share/sonic/hwsku/th5-a7060x6-64pe.config.bcm
 SAI_NUM_ECMP_MEMBERS=100
+SAI_NHG_HIERARCHICAL_NEXTHOP=false

device/arista/x86_64-arista_7060x6_64pe_b/Arista-7060X6-64PE-B-P28O72/th5-a7060x6-64pe.config.bcm

@@ -41,7 +41,8 @@ bcm_device:
             pfc_deadlock_seq_control : 1
             sai_tunnel_support: 2
             bcm_tunnel_term_compatible_mode: 1
-            l3_ecmp_member_first_lkup_mem_size: 12288
+            l3_ecmp_member_first_lkup_mem_size: 0
+            l3_ecmp_member_secondary_mem_size: 0
             stat_custom_receive0_management_mode: 1
 
 ---
@@ -1307,3 +1308,10 @@ device:
         DEVICE_CONFIG:
             AUTOLOAD_BOARD_SETTINGS: 0
 ...
+# Initialize SmartSAF functionality
+---
+device:
+    0:
+        TM_SMART_STORE_AND_FORWARD_CONFIG:
+            SMART_STORE_AND_FORWARD: 1
+...

device/arista/x86_64-arista_7060x6_64pe_b/Arista-7060X6-64PE-B-P32O64/sai.profile

@@ -1,2 +1,3 @@
 SAI_INIT_CONFIG_FILE=/usr/share/sonic/hwsku/th5-a7060x6-64pe.config.bcm
-SAI_NUM_ECMP_MEMBERS=96
+SAI_NUM_ECMP_MEMBERS=96
+SAI_NHG_HIERARCHICAL_NEXTHOP=false

device/arista/x86_64-arista_7060x6_64pe_b/Arista-7060X6-64PE-B-P32O64/th5-a7060x6-64pe.config.bcm

@@ -41,10 +41,10 @@ bcm_device:
             pfc_deadlock_seq_control : 1
             sai_tunnel_support: 2
             bcm_tunnel_term_compatible_mode: 1
-            l3_ecmp_member_first_lkup_mem_size: 12288
+            l3_ecmp_member_first_lkup_mem_size: 0
             stat_custom_receive0_management_mode: 1
             l3_alpm_large_vrf_mode: 1
-            l3_ecmp_member_secondary_mem_size: 4096
+            l3_ecmp_member_secondary_mem_size: 0
             sai_mmu_custom_config: 1
             sai_pfc_dlr_init_capability: 2
 ---
@@ -2575,4 +2575,10 @@ device:
                 TRAFFIC_CLASS: OBM_TC_LOSSLESS0
 
 ...
-
+# Initialize SmartSAF functionality
+---
+device:
+    0:
+        TM_SMART_STORE_AND_FORWARD_CONFIG:
+            SMART_STORE_AND_FORWARD: 1
+...

device/arista/x86_64-arista_7060x6_64pe_b/Arista-7060X6-64PE-B-P64/sai.profile

@@ -1,2 +1,3 @@
 SAI_INIT_CONFIG_FILE=/usr/share/sonic/hwsku/th5-a7060x6-64pe.config.bcm
-SAI_NUM_ECMP_MEMBERS=64
+SAI_NUM_ECMP_MEMBERS=64
+SAI_NHG_HIERARCHICAL_NEXTHOP=false

device/arista/x86_64-arista_7060x6_64pe_b/Arista-7060X6-64PE-B-P64/th5-a7060x6-64pe.config.bcm

@@ -41,10 +41,10 @@ bcm_device:
             pfc_deadlock_seq_control : 1
             sai_tunnel_support: 2
             bcm_tunnel_term_compatible_mode: 1
-            l3_ecmp_member_first_lkup_mem_size: 12288
+            l3_ecmp_member_first_lkup_mem_size: 0
             stat_custom_receive0_management_mode: 1
             l3_alpm_large_vrf_mode: 1
-            l3_ecmp_member_secondary_mem_size: 4096
+            l3_ecmp_member_secondary_mem_size: 0
             sai_mmu_custom_config: 1
             sai_pfc_dlr_init_capability: 2
 ---
@@ -2319,4 +2319,11 @@ device:
             :
                 TRAFFIC_CLASS: OBM_TC_LOSSLESS0
 
+...
+# Initialize SmartSAF functionality
+---
+device:
+    0:
+        TM_SMART_STORE_AND_FORWARD_CONFIG:
+            SMART_STORE_AND_FORWARD: 1
 ...