mach-tegra.c: Add 666MHz LP and 600/666/700Mhz GPU overclocks
cleaned up tegra dvfs a bit as well

Conflicts:
	arch/arm/mach-tegra/Kconfig
	arch/arm/mach-tegra/tegra3_clocks.c
	arch/arm/mach-tegra/tegra3_dvfs.c
	drivers/cpufreq/cpufreq_interactive.c