[202012][sonic-platform-common][sonic-platform-daemons] submodule

update

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

This PR adds the following commits are added in sonic-platform-common
ac25515 (HEAD -> 202012, origin/202012) [Credo][Ycable] changes for
synchronizing executing Telemetry API's when mux toggle is inprogress
(sonic-net#280)
fb304c1 [sonic_ssd] Nokia-7215: "show platform ssdhealth" not showing
health percent (sonic-net#279)
8bfe9c0 [Credo][Ycable] improve logging for Server Powered off/Faulty
cables (sonic-net#272)

The following commits are added in sonic-platform-daemons
6695c55 (HEAD -> 202012, origin/202012) [ycabled] fix the posting for
mux_cable_static_info per downlink when ycabled is spawned;
synchronizing executing Telemetry API (sonic-net#257)
6a315ae (HEAD -> 202012, origin/202012) [ycabled] Fix some syntax
warnings in ycabled (sonic-net#263)