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

Change-Id: Iceb4c81b612c04dd5eca86d4c5c8366910857fbd
fastcharge: increase battery charging current to use higher input current

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