Revert "defconfig: Enable GPU Overclocking"

This reverts commit 4bf880eb5f68b1346c203d5d7da2ac62e5bb84e1.

Conflicts:
	arch/arm/configs/aospal_flo_defconfig
Revert "GPU Overclocking: add 450 MHz option"

This reverts commit dbad9374bc2adb69247f965155c61735fe21375e.
Revert "GPU Overclock: GPU overclocking to 487.5 MHz"

This reverts commit a515155879cb5e45df58b6c7ba96c52f97d13329.