ARM: dts: msm: Add GPU properties for sdm845

Add device-specific GPU properties for sdm845.
Add GMU clock, registers, interrupts, bus, freq plan, SMMU
properties into GMU device node. Add GPU power levels.
Disable slumber.

Change-Id: I9e0bd0cebe35afa6eac0827dec2b7380a66b50de
Signed-off-by: Lokesh Batra <lbatra@codeaurora.org>
Signed-off-by: Kyle Piefer <kpiefer@codeaurora.org>
Signed-off-by: Sushmita Susheelendra <ssusheel@codeaurora.org>
Signed-off-by: George Shen <sqiao@codeaurora.org>