qcom-common: Move debug.mdpcomp.maxlayer setting

Change-Id: Ife113049c4508ee4340d7b241fdd8fe8420c8bab
qcom-common: Don't set ARCH_VARIANT here

 * Set it in the SoC specific configuration since this is shared now.

Change-Id: Ied597e36d8c246c15871e8480eb33294c74e8bba
qcom-common: power: Tuning and cleanups

 * Tune the governor for better power usage and interactivity
 * Reset tuning parameters if governor changes
 * Cleanup

Change-Id: I56f5dcc7f15e5dfbcc38338d515fd41d04662ab1