battery: Adding USB fastcharge option when connecting to PC

Using this command will charge, instead of normal USB connection:
echo '1' > /sys/devices/platform/htc_battery/fast_charge

enable fastcharge, thx again maxwen
commit 9420e39f6b7340f128b26b3feaa8ad4c4d32fb2d 1 parent 710cb1c
n3ocort3x authored 11 days ago

Change-Id: I339773b14c2bee907a31ee733744cd3074e36088