i2c-msm-v2: support for DMA engine

Port the i2c driver to use the Linux DMA engine
API instead of using sps-BAM API.

Change-Id: I5d36e90cec88cf6d4099a8a81a58987ac7b07271
Signed-off-by: Ankit Gupta <ankgupta@codeaurora.org>
Signed-off-by: Kiran Gunda <kgunda@codeaurora.org>