HACK: add sysfs interface to ziddey's MSM OTG hack for N4

(rebase)

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>