msm: vidc: delete v4l2 controls after queue release

vb queue release calls stop streaming. In stop streaming, video
driver may need to access the v4l2 controls. Deleting the v4l2
controls before releasing the vb queue may lead to NULL access.

Change-Id: I7b64fda2fab0cbd5030ca8e88363076238b218ea
Signed-off-by: Vikash Garodia <vgarodia@codeaurora.org>