fastcharge: initial Nexus 5 adaptation

added custom charge levels for better control over fastcharge

Signed-off-by: Paul Reioux <reioux@gmail.com>
Signed-off-by: Chester Kener <Cl3Kener@gmail.com>

Conflicts:
	arch/arm/mach-msm/Makefile

Change-Id: I40d38c96f28f16ce6c246ba017f13a09324aa39e