dma-mapping: add the missing functions to dma_map_ops

Add the missing callback functions on 32bit systems that can be used to
set the dma_mask and get the dma error information.

Change-Id: I69c454ea8cbceb4301ec812c5f74f6a751fc7df1
Signed-off-by: Charan Teja Reddy <charante@codeaurora.org>