msm: kgsl: Zero out the top 32 bits of alwayson reads
The top 32 bits of alwayson when read through CPU can
sometimes be incorrect because of hardware race condition between
CP and CPU. Therefore, zero out the top 32 bits before returning
to user.
CRs-Fixed: 864922
Change-Id: I8c0addce5627168d15ce43218cd26195a4f40c6b
Signed-off-by:
Harshdeep Dhatt <hdhatt@codeaurora.org>
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