fastchg: change fast charge to override the high current GPIO, not the USB cable mode

Conflicts:
	arch/arm/mach-omap2/board-tuna-connector.c
fastchg: Only enable fast charge GPIO as long as we actually have some charging to do.
OTG Host Mode On Charge: Version 3 - Thanks Caioketo

- Auto detects if its a charger in the OTG cable,
  if it is, charges, if it isnt, uses default OTG

https://github.com/caioketo/journeymanmod/
  commit/56c8eb7ba0b72dcb1a85982cb8bc8442c2ce2e33

Conflicts:
	arch/arm/mach-omap2/board-tuna-connector.c
fastchg: Remove vestigial fsa9480 "force AC" switch.

Conflicts:
	drivers/misc/fsa9480.c
cleanup for the new fastcharge.