usb/android gadget: notify uplevel when function disabled via sysfs interface

usb/android gadget: notify uplevel when function disabled via sysfs interface

BZ: 18273

Lack notification to uplevel, which cause incorrect ui in status bar.
so add this notification from driver to uplevel.

Change-Id: I766612f3f4de5124c7a8d46d668db7be24879788
Signed-off-by: Wu, Hao <hao.wu@intel.com>
Reviewed-on: http://android.intel.com:8080/31734
Reviewed-by: Tang, Richard <richard.tang@intel.com>
Reviewed-by: Kuppuswamy, Sathyanarayanan <sathyanarayanan.kuppuswamy@intel.com>
Reviewed-by: Yang, Fei <fei.yang@intel.com>
Tested-by: Sun, Jianhua <jianhua.sun@intel.com>
Reviewed-by: buildbot <buildbot@intel.com>
Tested-by: buildbot <buildbot@intel.com>