Fix tethering
Fix tethering

Using sendMessageAtFrontofQueue() causes issues here since there can be a start
that is deferred and it basically has no effect. Use defer which is more clean
and obvious here.

Bug: 8410547
Change-Id: I4fbf299283847e7c3009b87a81cb56e765b0e1e1

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