Added CPUfreq governor 'wheatley'

Thanks to r_data for taking the time to fix all the build errors for the Nexus 4.
Add abyssplugv2 & ondemandplus governors

Conflicts:
	drivers/cpufreq/Makefile
	include/asm-generic/cputime.h
	include/linux/cpufreq.h

Change-Id: I631c61c23097f0509f43786af2b436aada13b0e5