msm: VPU: Program preset VBIF register values from device tree

Preset register values may be required to load VBIF settings for QoS,
performance tuning, etc. Configurable in device tree to allow
variation per chip/platform.

Change-Id: I648a8f5c3638467031028a616e685fe702369b3b
Signed-off-by: Ahmed Abdul-Salam <aabdulsa@codeaurora.org>