dsp: voice: Reset music_info on SSR

Reset music_info playback states during SSR to fix incall music session
failure after SSR.
Music delivery session requests are getting ignored if the state is not reset.

Change-Id: I7dd736baa538fb3697c874230c5a9c02f90b6a06
Signed-off-by: Dhananjay Kumar <dhakumar@codeaurora.org>