video: msm: wfd: Add support for in-band sps/pps

This adds support for sps/pps to be prepended to all I-frames provided
by the core. This support needs to be provided by the core as in HDCP
use case, userspace can no longer prepend the sps/pps to I-frames, as
required by WFD spec.

Change-Id: If13437c6eae4088f913a9a7016a477a4342e8c35
Signed-off-by: Deva Ramasubramanian <dramasub@codeaurora.org>