aries | p1: drivers: usb: gadget: fix logic

add one more test for usb status
if sysfs var (&enable) content is false
then android_usb is disabled too

Signed-off-by: Humberto Borba <humberos@gmail.com>
Change-Id: I3ec4f3489e68235cc338bdf04b317f9c578fd934