drm/msm/a6xx: Fix llcc configuration for a660 gpu

Add the missing scache_cntl0 register programing which is required for
a660 gpu.

Signed-off-by: Akhil P Oommen <akhilpo@codeaurora.org>
Link: https://lore.kernel.org/r/20210730011945.v4.1.I110b87677ef16d97397fb7c81c07a16e1f5d211e@changeid


Signed-off-by: Rob Clark <robdclark@chromium.org>