msm: kgsl: Allocate GMU static buffers before other buffers

This will ensure that the VAs of these buffers will stay fixed
and reduce churn on both host and gmu fw sides.

Change-Id: Iea023fe8b23033570e1392d18cfd2b5d5ed5f84a
Signed-off-by: Carter Cooper <ccooper@codeaurora.org>