Added CPUfreq governor 'wheatley'

Thanks to r_data for taking the time to fix all the build errors for the Nexus 4.

	modified:   drivers/cpufreq/Kconfig
	modified:   drivers/cpufreq/Makefile
	new file:   drivers/cpufreq/cpufreq_wheatley.c
	modified:   include/linux/cpufreq.h