fastcharge: initial Nexus 5 adaptation

added custom charge levels for better control over fastcharge

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

Conflicts:
	arch/arm/mach-msm/Kconfig
	arch/arm/mach-msm/Makefile
	drivers/usb/dwc3/dwc3_otg.c

Change-Id: I94922c22a04d8055cedee4cd1fb35554bd4bc3d8