revert commits related to old CPU VDD control

this commit reverts:

commit 8e873c6d01054a2a180cf5e49ab464e62314776e
Author: DooMLoRD <metoo.mememe@gmail.com>
Date:   Wed Sep 18 02:43:02 2013 +0530

    lowered MIN allowed voltage to 700mV

commit f23ab0503ddf50c8cb8ed836ab936df6fdf8d2de
Author: DooMLoRD <metoo.mememe@gmail.com>
Date:   Wed Sep 18 02:23:30 2013 +0530

    added CPU voltage VDD control (thanks to @Faux123) ported to msm8974 platform