soc: pcm: add qtime mixer control

Add qtime mixer control to receive qtime value in pcm driver.
Add mechanism to delay asm using the time value received.
Update platform data structure to hold pointers to all pcm's
created in a platform.

CRs-Fixed: 2419295
Change-Id: I623e568196357af7909f3113d998df3c64501420
Signed-off-by: Vignesh Kulothungan <vigneshk@codeaurora.org>