msm: vidc: Remove unused extradata declarations

V4L2_MPEG_VIDC_INDEX_EXTRADATA_DIGITAL_ZOOM, V4L2_MPEG_VIDC_\
INDEX_EXTRADATA_DIGITAL_ZOOM, and V4L2_MPEG_VIDC_INDEX_EXTRA\
DATA_ASPECT_RATIO have been superceded by variants that don't
have "INDEX" in the name.

Change-Id: I08d26d3000d15efd5d86c5030f53bae4f5fc3138
Signed-off-by: Deva Ramasubramanian <dramasub@codeaurora.org>