Update prebuilts
Remove preset cpufreq values from init.qcom.rc

The up_threshold and sampling_rate are set in power HAL now.
Also change scaling_min_freq to stock, for testing though so
will be reverted if causing regressions.
Remove dev.pm.dyn_samplingrate

Depreciated. Was only used in ICS. The power HAL has replaced this.
Remove config_unplugTurnsOnScreen
Remove direct and lpa flags from audio_policy.conf

Requires 7x30 patches from CM gerrit.
Fixes issues with VOIP and certain games like Angry Birds.
Update prebuilts