[202012][submodule] update sonic-platform-common and sonic-platform-d…

…aemons (#8607)


This PR updates the following commits in sonic-platform-common
9d2e7d5 Add y-cable driver for simulated mux (#213)
e3e8f09 [Y-Cable][Broadcom] Broadcom implementation of YCable class which inherits from YCableBase required for Y-Cable API's in sonic-platform-daemons (#208)

This PR updates the following commits in sonic-platform-daemons

ebc4f3f [Y-Cable] create unknown entries for mux_cable when there is a cable present but module definition is not present/invalid module
b10c417 [xcvrd] initial support for integrating vendor specfic class objects for calling Y-Cable API's inside xcvrd (#197) (#213)
f3fc1ea [y-cable] fix for logging the xcvrd metrics before writing the state to the State-DB (#208)


Signed-off-by: vaibhav-dahiya <vdahiya@microsoft.com>