gpu: enable slumber

Conflicts:
	arch/arm/mach-msm/devices-msm8x60.c
boost L2 bandwidth

Conflicts:
	arch/arm/mach-msm/acpuclock-8x60.c
fixed issue: invalid bandwidth request (5)
sibiling cpufreq fix (thanks to @RaymanFX)

Conflicts:
	drivers/cpufreq/cpufreq.c