msm: vidc: Add AFD and CC metadata support to extradata

Add support and control for setting Active format
description and closed caption meta data in the
extradata. FW parses metadata and adds it to the
extradata. Client can use control to parse extradata
for the metadata information.

Change-Id: I79fb71e635927c95e0792862c9dea7d96f58e895
Signed-off-by: Jayasena Sangaraboina <jsanga@codeaurora.org>

Conflicts:
	drivers/media/platform/msm/vidc/vidc_hfi.h
	include/media/msm_vidc.h
finally, this shit builds!

Change-Id: I621d51ca175e201efa78a889220e999c843d38ef