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: DooMLoRD <metoo.mememe@gmail.com>

Conflicts:
	arch/arm/mach-msm/Makefile
fastcharge: initial port to Xperia Z1
fastcharge: some more fixes specific to Xperia Z1