[sonic-frr] avoid notify race between io and main pthreads #16288
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Why I did it
Cherry-Pick #11926 into 202012
Work item tracking
How I did it
Create patch file to avoid notify race between io and main pthreads.
How to verify it
PR test, physical DUT for bgp related regression tests.
Which release branch to backport (provide reason below if selected)
Tested branch (Please provide the tested image version)
Description for the changelog
Link to config_db schema for YANG module changes
A picture of a cute animal (not mandatory but encouraged)