msm: vidc: Add support for MBI extradata

Macro Block Information extradata (if enabled) allows interested
clients to query for metadata about each macroblock.

Change-Id: Icfee32770018338e28ae149e1ccb654f5a48cbec
Signed-off-by: Deva Ramasubramanian <dramasub@codeaurora.org>

Conflicts:
	drivers/media/platform/msm/vidc/vidc_hfi_api.h
	include/linux/videodev2.h
msm: vidc: Add description of LTR Extradata

The missing string descriptor caused a mismatch in array sizes
causing the v4l2 control framework make an out of bounds access.

Change-Id: I9a9f64e16ca95163d800702d94528833f5892537
Signed-off-by: Deva Ramasubramanian <dramasub@codeaurora.org>
Signed-off-by: houst0nn <houstonn@gmail.com>
msm: vidc: set ctrl to request sequence header for encoder

The encoder depended on a debug variable i.e. ftb_count, to
request firmware to send sequence header. Remove this
dependency and make the request only when the encoder
client requests using the provided set ctrl.

b/11051201

Change-Id: Iac4104c33eef62da553066c736b7adc87834d2ac
Signed-off-by: Arun Menon <avmenon@codeaurora.org>
Signed-off-by: houst0nn <houstonn@gmail.com>