msm: kgsl: Increase REG_RBBM_CNTL value to 0xFFFF for A200

Increase number of clocks that RBBM will wait before de-asserting
the Register Clock Active signal. This fixes kernel panics during
stability tests on multiple devices

Change-Id: I50ad69f28b50444e88239c2332bd5756db1ae089
Signed-off-by: Rammohan Basavaraju <rammoh@codeaurora.org>
msm: kgsl: Update pagetable on context destruction for A20x

Ensure that pagetable is updated during context destruction. This
resolves stability issues during Camera launch/exit scenarios. Applies
only to A20x GPUs. This change is already done for Z180 device.

Change-Id: I955c7220aa8234009f5bca0a273093e47147279d
Signed-off-by: Rammohan Basavaraju <rammoh@codeaurora.org>