Low CPU Clocks: Allow ultra low CPU frequencies for better battery performance

while screen is on or background operations like audio books and music

Signed-off-by: Paul Reioux <reioux@gmail.com>

Conflicts:
	arch/arm/mach-msm/Kconfig
	arch/arm/mach-msm/acpuclock-8064.c
	arch/arm/mach-msm/acpuclock-krait.c
acpuclock-krait: fix low cpuclockd config