[202012][submodule] Branch out sonic-platform-daemons submodule for 2…

…02012 (#7314)

- [xcvrd] refactor Y-Cable firmware information to conform with all vendors (#171)
- [thermalctld] No need exit thermalcltd when loading invalid policy file (#172) <--- branch point

Signed-off-by: Danny Allen <daall@microsoft.com>