msm: vidc: add superframe encode support

In HFR (High Frame Rate) encoding usecases client
sends superframe (single input multiple frames).
So add support for encoding superframes.

Change-Id: I6f726d0ccf5b4b831e517efd3587d822da7eaae5
Signed-off-by: Maheshwar Ajja <majja@codeaurora.org>