msm: kgsl: Add properties for MinAccessLength and UBWC Mode

On A6xx, KGSL needs to program the MinAcessLength and UBWC Mode,
which would be specified through the devicetree, into multiple
protected registers. We also need to pass this information to
the UMD driver. Hence add properties for these two fields to
propagate this information to the UMD.

Change-Id: If37db813d46075bf64472658919f8416556c40a0
Signed-off-by: Shrenuj Bansal <shrenujb@codeaurora.org>