msm: ais: Avoid deadlock for vb2 operations using separate lock

Use mutex lock for all VB2 operations, and use separatelock other
than used for stop streaming operation to avoid dead lock.

Change-Id: Ibb466f81cb2825a77073712419fd17c9759ecde4
Signed-off-by: Rahul Sharma <sharah@codeaurora.org>