[Mellanox][202012] Update SAI to 1.20.2.6 and SDK/FW to 4.5.1208/2010.1218 (#9818)

- Why I did it
To include latest fixes.
1. On CMIS modules, after low power configuration, the firmware waited for the module state to be ModuleReady instead of ModuleLowPower causing delays.
2. When connecting SN4600C, 100GbE port with CWDM4 module (Gen 3.0), link up time is 30 seconds.
3. Add T1 ECMP Overlay support

- How I did it
Updated SDK/SAI submodule and relevant makefiles with the required versions.

- How to verify it
Build an image and run tests from "sonic-mgmt".

Signed-off-by: Volodymyr Samotiy <volodymyrs@nvidia.com>

Author: volodymyrsamotiy

platform/mellanox/fw.mk

@@ -11,17 +11,17 @@ else
 FW_FROM_URL = n
 endif
 
-MLNX_SPC_FW_VERSION = 13.2008.3358
+MLNX_SPC_FW_VERSION = 13.2010.1218
 MLNX_SPC_FW_FILE = fw-SPC-rel-$(subst .,_,$(MLNX_SPC_FW_VERSION))-EVB.mfa
 $(MLNX_SPC_FW_FILE)_PATH = $(MLNX_FW_BASE_PATH)
 $(MLNX_SPC_FW_FILE)_URL = $(MLNX_FW_BASE_URL)/$(MLNX_SPC_FW_FILE)
 
-MLNX_SPC2_FW_VERSION = 29.2008.3358
+MLNX_SPC2_FW_VERSION = 29.2010.1218
 MLNX_SPC2_FW_FILE = fw-SPC2-rel-$(subst .,_,$(MLNX_SPC2_FW_VERSION))-EVB.mfa
 $(MLNX_SPC2_FW_FILE)_PATH = $(MLNX_FW_BASE_PATH)
 $(MLNX_SPC2_FW_FILE)_URL = $(MLNX_FW_BASE_URL)/$(MLNX_SPC2_FW_FILE)
 
-MLNX_SPC3_FW_VERSION = 30.2008.3358
+MLNX_SPC3_FW_VERSION = 30.2010.1218
 MLNX_SPC3_FW_FILE = fw-SPC3-rel-$(subst .,_,$(MLNX_SPC3_FW_VERSION))-EVB.mfa
 $(MLNX_SPC3_FW_FILE)_PATH = $(MLNX_FW_BASE_PATH)
 $(MLNX_SPC3_FW_FILE)_URL = $(MLNX_FW_BASE_URL)/$(MLNX_SPC3_FW_FILE)

platform/mellanox/mlnx-sai.mk

@@ -1,6 +1,6 @@
 # Mellanox SAI
 
-MLNX_SAI_VERSION = SAIRel1.18.3.0
+MLNX_SAI_VERSION = SAIRel1.20.2.6
 
 export MLNX_SAI_VERSION
 

platform/mellanox/mlnx-sai/SAI-Implementation

@@ -1,6 +1,6 @@
 MLNX_SDK_BASE_PATH = $(PLATFORM_PATH)/sdk-src/sx-kernel/Switch-SDK-drivers/bin/
 MLNX_SDK_PKG_BASE_PATH = $(MLNX_SDK_BASE_PATH)/$(BLDENV)/
-MLNX_SDK_VERSION = 4.4.3360
+MLNX_SDK_VERSION = 4.5.1208
 MLNX_SDK_ISSU_VERSION = 101
 
 MLNX_SDK_DEB_VERSION = $(subst -,.,$(subst _,.,$(MLNX_SDK_VERSION)))