Revert "msm: kgsl: The memory entry pending flag should be guarded"

This reverts commit a97a3661e52ec691d21b8176d2e761c1e461cf76.
Revert "msm: kgsl: Changing to kref_get_unless_zero for process refcount"

This reverts commit 6571520071aabd95d58bfef92c03fa1088d88b6d.
Revert "msm: kgsl: Use GPU to switch pagetables when current one is default"

This reverts commit e10c72e7bd658cef32d80fcaeb1657ee0928ece3.