msm: ipa: Fix to use GFP_DMA flag

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

Change-Id: I6f35e7f2179dc48f718221f6a3d228aca67c4154
Acked-by: Ashok Vuyyuru <avuyyuru@qti.qualcomm.com>
Signed-off-by: Mohammed Javid <mjavid@codeaurora.org>