Clean up init.g2.usb.rc and update cpufreq settings from houst0nn

Change-Id: I124fea7a3bcf74d4cf5cbb7082f904bdbce8f99c
g2: fix audio distortion at high volumes

will apply proper authorship once the original author provides me with his
email address

Change-Id: If63cd384c67efeaa60f5f07f98213c128b853a94