[202012]BRCM SAI 4.3.7.1-1 pick up fix CS00012263713 (mirrored packet with extra VLAN Tag)

[gechiang]

Why I did it

Pick up fix for CS00012263713 (mirrored packet with extra VLAN Tag) BRCM SAI 4.3.7.1-1

Preliminary tests look fine. BGP neighbors were all up with proper routes programmed
interfaces are all up
Manually ran the following test cases on 7050CX3 (TD3) T0 DUT and all passed:

     fib/test_fib.py
     acl/test_acl.py
     arp/test_neighbor_mac_noptf.py
     fdb/test_fdb.py
     decap/test_decap.py
     pc/test_lag_2.py
     pc/test_po_cleanup.py
     pc/test_po_update.py
     everflow/test_everflow_ipv6.py
     everflow/test_everflow_testbed.py
     route/test_default_route.py
     ipfwd/test_dip_sip.py
     copp/test_copp.py
     crm/test_crm.py

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

• 201811
• 201911
• 202006
• 202012
• 202106
• 202111
• 202205

Description for the changelog

BRCM SAI 4.3.7.1-1 Pick up fix for CS00012263713 (mirrored packet with extra VLAN Tag) BRCM SAI 4.3.7.1-1

Ensure to add label/tag for the feature raised. example - PR#2174 where, Generic Config and Update feature has been labelled as GCU.

Link to config_db schema for YANG module changes

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