Voltage interface for GPU

Conflicts:
	drivers/cpufreq/cpufreq.c
GPU: OC: A nice little way to modify pll15_config.l on the fly to provide OC steps of 504, 544 and 600.  Still trying to find a way to reflect tha actual max_gpuclk, all commented code still wont allow it, will look at agin at a later date

Conflicts:
	drivers/gpu/msm/kgsl_pwrctrl.c
GPU: re-add max_vectors MBPS value of 4816