asoc: sa6155: support SSR handling for snd card status

Use SND event FWK for SSR handling. Change snd card
status upon SERVICE_DOWN and SERVICE_UP callback
when adsp subsystem restart happen.

Change-Id: I333e2343e0670f53d40764ce86094c73c836c5c4
Signed-off-by: Erin Yan <xinyey@codeaurora.org>