arm64: Change type of dma_{alloc,free}_from_contiguous

The types of dma_alloc_from_contiguous and dma_free_from_contiguous
have changed to work on pfns instead of struct pages. Update the
callers accordingly in arm64 dma-mapping APIs.

Change-Id: I1982d21b867586df0d7d90604bda426907e08266
Signed-off-by: Laura Abbott <lauraa@codeaurora.org>