Revert "fix compile erros and duplication re kgsl_pwrctrl"

This reverts commit c9b6cba28e4ac47156fa0c717eba35899d26e1ab.
Revert "msm: kgsl: Ensure glitch free changing of the GPU frequency"

This reverts commit d959b3ad1926a8dcaffd2062a1b2ef4be7380fda.
Revert "kgsl: add gpu overclock"

This reverts commit cdec0ab071112c6b61b9e5de419a6d423df20ee1.
Revert "msm: kgsl: Add new sysfs node to list GPU clock frequencies"

This reverts commit df106b47ea36568ae9d2a409e2f8fc84aeb4d2de.