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

Thanks to Faux123 for this commit and Ziddey for the OTG Hack
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>

Conflicts:
	drivers/usb/otg/msm_otg.c
Merge branch 'kitkat' of https://github.com/Kiltnar/android_kernel_google_msm into kitkat