USB Fast Charge for Nexus 5

Increases input current limit to 900mA when charging via USB.
This patch does not force AC mode because this device is capable
of a charging at a much higher current limit than some USB ports
are able to deliver.

Signed-off-by: flar2 <asegaert@gmail.com>
Signed-off-by: engstk <eng.stk@sapo.pt>

Conflicts:
	drivers/power/bq24192_charger.c