Revert "mach_tegra / cpufreq: Add cmdline interface"

This reverts commit 8c4101ebe496d70a395fca0b09bd4bf3c3687c34.
Revert "mach-tegra: cpu-tegra: set default min clock on boot. (102)"

This reverts commit fc88020d59977abe356e4778ded9ce398ee23444.