drm/msm/iommu: optimize map/unmap

Using map_pages/unmap_pages cuts down on the # of pgtable walks needed
in the process of finding where to insert/remove an entry.  The end
result is ~5-10x faster than mapping a single page at a time.

v2: Rename iommu_pgsize(), drop obsolete comments, fix error handling
    in msm_iommu_pagetable_map()

Signed-off-by: Rob Clark <[email protected]>
Reviewed-by: Sai Prakash Ranjan <[email protected]>
Patchwork: https://patchwork.freedesktop.org/patch/498892/
Link: https://lore.kernel.org/r/[email protected]

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