fastcharge: initial adaptation for Moto X

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

Conflicts:
	arch/arm/mach-msm/Kconfig

Conflicts:
	arch/arm/mach-msm/Makefile
power: fastchg: Tweaks for better functionality and readability

* Default to enabled and AC level
* Only have two modes - enabled and disabled

Signed-off-by: Zhao Wei Liew <zhaoweiliew@gmail.com>