msm: vidc: send dmabuf pointer instead of fd

Send dmabuf pointer in reserved fields instead of fd
to CVP driver for internal CVP usage buffers as fd is
not available for these buffers.

Change-Id: Ic25a445253b4ae05748d47b7caf0b88e909aad7e
Signed-off-by: Maheshwar Ajja <majja@codeaurora.org>