Revert "msm: kgsl: Make sure RBBM_INT_0_STATUS is not transitory"

This reverts commit e8046965.

The issue is fixed in GMU firmware and this SWA is no longer
required.

Change-Id: I4a61f3a0e8b7cfe735879988b32deb8e662225c0
Signed-off-by: Harshdeep Dhatt <hdhatt@codeaurora.org>