Revert "msm: kgsl: Update pagetable on context destruction
 for A20x"

This reverts commit f0d1c9b79e05972816b92bd43b29e98f764826ea.

Reverting this change since it corrupts Bin Base Offset between
two draws of a Binning pass, resulting in GPU hang.

Change-Id: I4a3fdc9d3180b96ba617753855c7d789f2c0f5e3
Signed-off-by: Rajesh Kemisetti <rajeshk@codeaurora.org>