Revert "cpufreq: CPU OC adjust voltages for 1500 and 1600 MHz frequencies for n80xx devices"

This reverts commit 36cf4ca9c78144f336dad4af88049b4a6bf59fac.
Revert "cpufreq: 1600MHz CPU OC (n8010 version)"

This reverts commit 1d75a501447e609dbb412c350d79ac1ef720a630.