msm: kgsl: Add cache flush for A20x

Adding extra cache flush command to make sure that CP block
gets event from RB all the time to avoid race conditions because of
clock switches. this is to improve stability on 8x25 target.

Signed-off-by: Rajesh Kemisetti <rajeshk@codeaurora.org>

Conflicts:

	drivers/gpu/msm/adreno_ringbuffer.c
Change-Id: Ie411be46fa166864073d35c50085a8f2506d0eb8

Signed-off-by: Vikram Orre <vorre@codeaurora.org>
(cherry picked from commit 4ab5849a194b31b58a397a28cd1a38751a06b360)

Signed-off-by: Satish Kamuju <skamuj@codeaurora.org>
Merge "msm: kgsl: Add cache flush for A20x"