Tegra3 Variant based Overclocking and quadcore gaming fix

Also add Tegra3 Variant ID to debugfs for ease of identifying various
variants within the T3 family

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