msm: kgsl: Disable LLC for GPU

LLC for GPU is not currently supported. Do not
set it up to prevent instability.

Change-Id: I1ddba6b1895e28cd16514f646cf84c57b9593e0f
Signed-off-by: Kyle Piefer <kpiefer@codeaurora.org>
Signed-off-by: Oleg Perelet <operelet@codeaurora.org>