msm: vidc: Move to new msm_dma apis to map/unmap

Replace dma_map_sg/dma_unmap_sg with msm_dma_map_sg/msm_dma_unmap_sg
apis to avoid unmapping ion memory till the time they are freed.

Change-Id: If4f435dead068b51fd1a67b764fe065e17e44e29
Signed-off-by: Arun Menon <avmenon@codeaurora.org>