mmc: msm_sdcc: set sdcc device dma_mask to 0xffffffff

DMA hardware (ADM or SPS) connected to SDCC controllers
is capable of addressing the entire 32 bit adddress space
so this change sets the sdcc devices dma_mask to
0xffffffff.

Changing the dma_mask to indicate full 32 bit address space
will avoid unnecessary bouncing of buffers from high memory
to low memory.

CRs-fixed: 321813
Change-Id: I3180953d02361a7ea9e7f33ee7d547a8034ee133
Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>