Revert "msm: krait: add CPU Voltage control."

This reverts commit d69ad9125c3aa34c3f48f6e2a9f46e24696383c6.
Voltage Control: initial voltage control for MSM Snapdragon 800 SOC

Signed-off-by: Paul Reioux <reioux@gmail.com>

Dorimanx: I have the Kconfig in drivers/cpufreq/Kconfig.cpumods
CONFIG: Voltage Control enabled