Revert "msm: kgsl: Prevent race conditions when freeing memory"

This reverts commit 1811ce1b876ab0a836c2ffc7abb8151469560941.
Revert "msm: kgsl: Don't do intensive memory recovery when allocating big pages"

This reverts commit a6c87406a5c6cb6364d3ba2aa577667e9cc08be2.