Revert "msm_otg: hack to allow manual usb host mode (externally powered) - ziddey's MSM OTG hack for N4"

This reverts commit 66261b95c6c20790a3e8c4767549824fb652cc62.
msm_otg: hack to allow externally powered usb host mode
HACK: add sysfs interface to ziddey's MSM OTG hack for N4

this allows for normal / OTG Hack based on user sysfs command.
minor code clean up as well.

Signed-off-by: Paul Reioux <reioux@gmail.com>
HACK USB OTG: fix logic derp

Signed-off-by: Paul Reioux <reioux@gmail.com>