Revert "USB force fast charging"

This reverts commit 7710f23ded8a24604bfe4e3f6182bfe897b75213.
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.

Conflicts:
	arch/arm/mach-msm/Makefile
drivers: usb: otg: msm_otg: Add back fastcharge code

Also changed the load from 1000mA to 900mA to conform to flar2's changes.
arch: arm: mach-msm: fastchg: Enable by default