Added simple sysfs interface to force adapters that are detected as
USB to charge as AC.

Conflicts:
	arch/arm/mach-omap2/Kconfig
fastchg: change fast charge to override the high current GPIO, not the USB cable mode
fastchg: Remove vestigial fsa9480 "force AC" switch.
fastchg: Only enable fast charge GPIO as long as we actually have some charging to do.