st-hal: return success if session start failed due to ssr/pdr

It's possible that session start request from client can fail
due to ssr or pdr, then the state maintained within sound trigger
hw session is incorrect, then even session gets resumed during
handling ssr, all the subsequent event will be rejected.
Return success state to sound trigger hw service as session
is expected to be resumed internally.

Change-Id: I624122b6be38ca7c6bf6b9cf107cca0a95b21ed6
1 file changed