GPU Overclock: initial GPU overclocking to 487.5 MHz

Signed-off-by: Paul Reioux <reioux@gmail.com>

Conflicts:
	arch/arm/mach-msm/Kconfig
finish GPU OC 487.5 mhz
GPU Overclocking: add 450 MHz option

Signed-off-by: Paul Reioux <reioux@gmail.com>

Conflicts:
	arch/arm/mach-msm/Kconfig
finish GPU OC 450 mhz
5.5.3 and default to no gpu oc