msm: ipa: Fix to use GFP_DMA and add check for dma_map_single

IPAv2 hardware works with 32 bit addressing,
so allocate a kernel memory using GFP_DMA flag
which is processed by IPA hardware.

Add a error check for return of dma_map_single
using dma_mapping_error API.

Change-Id: I08e3eec8e9b2d81f945283a72338c0a8f23e2ac9
Acked-by: Mohammed Javid <mjavid@qti.qualcomm.com>
Signed-off-by: Utkarsh Saxena <usaxena@codeaurora.org>