C2AIDL: unblock allocate from C2IGBA on stop()/reelase()

alocate() can be blocked if consumer does not release buffer during
stop()/release(). unblock allocate() in the case.

Bug: 366059860
Test: presubmit
Change-Id: I856cb40d531984341156693258d3dd294c7a9ac9
5 files changed