msm: mdss: use delayed unmap for smmu mappings

Replace dma_map_sg/unmap_sg with msm_dma_map_sg_lazy
/msm_dma_unmpa_sg to avoid buffer unmapping till
the time it is free.

Change-Id: I0559238301882a89d25f3cf99a60140c9e9c1bdf
Signed-off-by: Olav Haugan <ohaugan@codeaurora.org>
Signed-off-by: Dhaval Patel <pdhaval@codeaurora.org>