mach-tegra: Low Power core overdrive

This overdrive unlocks the low power core (LP)'s full potential of 620 MHz

Signed-off-by: Paul Reioux <reioux@gmail.com>

Conflicts:
	arch/arm/mach-tegra/Kconfig
	arch/arm/mach-tegra/common.c
	arch/arm/mach-tegra/tegra3_dvfs.c
	arch/arm/mach-tegra/tegra3_speedo.c

Change-Id: Ie7fda73cc58998a3f71a4f15571ff1c590f6b1ae
mach-tegra: tegra3_clocks.c: use max emc rate at LP max for smoothness

Signed-off-by: Syukri Lajin <ginger_boy92@hotmail.com>