GPU Overclock: GPU overclocking to 487.5 MHz

Signed-off-by: Paul Reioux <reioux@gmail.com>
GPU Overclocking: add 450 MHz option

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

Conflicts:
	arch/arm/mach-msm/clock-8960.c
Enable GPU overclock and lower ib request