tegra: lp core overclock to 620Mhz

Conflicts:
	arch/arm/mach-tegra/tegra3_clocks.c
cpu-tegra.c: remove stress test code to allow building without userspace gov
tegra: changes to voltages and voltage table

Conflicts:
	arch/arm/mach-tegra/tegra3_dvfs.c
	drivers/cpufreq/cpufreq.c
tegra: add LP overclock config interface

Conflicts:
	arch/arm/configs/kangaroo_defconfig
	arch/arm/mach-tegra/Kconfig
	arch/arm/mach-tegra/tegra3_clocks.c
	arch/arm/mach-tegra/tegra3_dvfs.c