ASoC: msm: qdsp6v2: update platform driver for new SSR design.

Update PCM platform driver to handle the reset events during
SSR and also unblock the write wait according to
the new SSR design.

CRs-Fixed: 661491
Change-Id: Id0b4950ffc0eb130dbfdce36375629a683752044
Signed-off-by: Santosh Mardi <gsantosh@codeaurora.org>