Revert "tegra: custom user voltage control"

This reverts commit eb57f5d88187ce83791907de26ea6bc75c19ccc4.
tegra: custom user voltage control (thansk faux123)

-also some voltage tweaks and debugging statement tweaks
tegra3  dvfs/clock tweaks

-Allow conditional GPU OC compile
-Frequency and voltage tweaks
-Hope to fix units that can't OC (CPU process_id = 3)
-Tweak cputegra to see if we can get the CPU to settle back a bit
-Tweak frequencies, some lower frequencies should be used more often for
better battery

Conflicts:
	arch/arm/mach-tegra/cpu-tegra.c
	arch/arm/mach-tegra/tegra3_clocks.c