msm: vidc: Add support for output crop extra data

Venus firmware reports the crop dimensions for
each FBD in the extra data buffer. This change is
needed to support the new extra data type -
MSM_VIDC_EXTRADATA_OUTPUT_CROP.

CRs-Fixed: 999551
Change-Id: I3d1aa4a44701192e4bd85bdee29d6f2a49b9e5a7
Signed-off-by: Arun Menon <avmenon@codeaurora.org>