mm: dma_cache operations for non linearly mapped buffers

dma_cache_*_ops() perform cache maintenance operations on linearly and
non-linearly mapped buffers.

Signed-off-by: Abhijeet Dharmapurikar <adharmap@quicinc.com>
(cherry picked from commit 0732f4d296179ccb5d17d9087e5a91b6046f1862)

Conflicts:

	arch/arm/mm/dma-mapping.c

Change-Id: Ia17993ebd2fcd116b64b070fbdef8b2af2708d19