msm: vidc: Add support for setting initial qp

Adds support to set initial qp, thereby allowing the client to set
initial qp for I,P, and B frames.

Signed-off-by: Ashray Kulkarni <ashrayk@codeaurora.org>

Conflicts:
	drivers/media/platform/msm/vidc/vidc_hfi_api.h
	drivers/media/platform/msm/vidc/vidc_hfi_helper.h

Change-Id: I6ea7f01077f42e9063ddce844925be51e9c25e83