dmaengine: gpi: add GPI dmaengine driver snapshot

This change ports GPI dmaengine driver and it's dependencies
from msm-4.9 to msm-4.14. All the files are as is from msm-4.9
Additional changes were made to gpi driver to support 4.14
kernel.

This gpi dmaengine driver snapshot is taken as of msm-4.9
commit: e491a3487768
("Merge "msm: vidc: Check for frame size for calculating CF").

CRs-Fixed: 2170554
Change-Id: If04ab521255501b941295ad1de59e5a4775bf849
Signed-off-by: Sujeev Dias <sdias@codeaurora.org>