Revert "Adjust GPU OC and GPU governor interfaces to function properly with each other"

This reverts commit 6b5ed11c1ae493b82d5d66b14298f679b5eb5b91.
Revert "drivers/gpu/pvr/pvr_governor: add and enable PVR GPU governor"

This reverts commit 70b420f601e3958eee8669730fe0fce04f556bf4.
Makefile: Add Config Variable Os - O2 - O3 for choice Compilation
added xz kernel compression