ASoC: msm: qdsp6v2: Add SSR support for Voice2

When Modem SSR happens, change the voice2 call state to
VOC_ERROR. Then MVM, CVP and CVS handles will be cleaned up
properly when ending the call or starting a new call.

Change-Id: If5e2cd0a35231a832336c7611e25358b3c2a3d97
Signed-off-by: Helen Zeng <xiaoyunz@codeaurora.org>