Update j1sp-perf_defconfig

Enable the Wheatley governor by default
Update Kconfig

Added CPUfreq governor 'wheatley'
Update Makefile

Added CPUfreq governor 'wheatley'
Create cpufreq_wheatley.c

Added CPUfreq governor 'wheatley'
Update cpufreq.h

Added CPUfreq governor 'wheatley'
Merge pull request #1 from bmos/add_wheatley

Added CPUfreq governor 'wheatley' and enable it