Add Tethering class bit check.
Add Tethering class bit check.

Change-Id: Iaa87c91c4b3db3b77c2e6c4f559fa2e438c9c247

xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base