msm: vidc: New extradata for hdr10 plus metadata

Using this extradata, clients can provided packed metadata
for each frame.This will be included in the encoded bitstream.

CRs-Fixed: 2317864
Change-Id: I31fe59872a3441eee49eb7b312e89df57eee5f2e
Signed-off-by: Chinmay Sawarkar <chinmays@codeaurora.org>