msm: kgsl: Use API to configure DMA

We need to set up DMA at boot to fill in the
DMA data structures and allow attaching to IOMMU
context banks. Do this during GMU probe and IOMMU
probe.

Change-Id: Iae7dbc8cd1b678ae850345e57f49447a29f68308
Signed-off-by: Kyle Piefer <kpiefer@codeaurora.org>