USB force fast charging

-Use base from Chad Froebel <chadfroebel@gmail.com> so we continue to
use the same generic sysfs mechanism

-Referenced franco's git for drivers/usb/otg/msm_otg.c changes
https://github.com/franciscofranco/mako/commit/5a8a4c8e23c7e1df39c740b9ce1d5dda20b0ede3

Off by default

Turn on:
echo 1 > /sys/kernel/fast_charge/force_fast_charge

Turn off:
echo 0 > /sys/kernel/fast_charge/force_fast_charge

Signed-off-by: franciscofranco <franciscofranco.1990@gmail.com>

Change-Id: I705a01ed07b615c4d2533a8226ae1698ad495163
flo_defconfig: enable fastcharge

Change-Id: I5dfceb82d1a16ce425b571676cf56b295cd468e9
Signed-off-by: Domenico Marino <johnlemon.lol@gmail.com>