mach_tegra / cpufreq: Add cmdline interface

Signed-off-by: Dennis Rassmann <showp1984@gmail.com>

Conflicts:

	arch/arm/mach-tegra/Kconfig
mach-tegra: platsmp: this is only executed when the cpu is brought online, hence we don't need mpdecision here

Signed-off-by: Dennis Rassmann <showp1984@gmail.com>

Conflicts:

	arch/arm/mach-tegra/platsmp.c