krait: support overclocking up to 2.16 GHz
adjust krait and regulator voltages for 700mV/1350mV min/max voltages
Revert "krait: support overclocking up to 2.16 GHz"

This reverts commit b1786d6ecc22427238eb8a73c0b99ca619f9daac.
acpuclock: CPU OC up to 1.9GHz
msm: lower max voltages to 1300mV
defconfig: change default max frequency to 1566 MHz due to removal of
1512 MHz CPU frequency
gpu: overclock to 450mhz