Camera: fix long dequeueBuffer call

Fix the long (>1s) dequeueBuffer call when a stream is managed by
Camera3BufferManager and its consumer end discards free buffers.

Test: CTS, no more long dequeBuffer call in GCA mode switch
Bug: 126054873
Change-Id: I03d6526b076796bb44f15cc2c4a092ff3d04fc1d
4 files changed