msm: vidc: Add CVP metadata mode controls

Add CVP extradata as custom extradata. Clients can use
this to provide CVP metadata. If not set, kernel will use
CVP hardware to fill metadata. Also, introduce a new
v4l2 control to forcefully disable CVP extradata.

CRs-Fixed: 2384822
Change-Id: I7ecbc66cea2e3b340dcefbe794a22b91639a666d
Signed-off-by: Mihir Ganu <mganu@codeaurora.org>