p2p: send dedicated connection state update to stop tethering while location mode is off

When location mode is off, tethering service cannot receive
regular connection state changed event, and won't stop tethering
normally.

Bug: 185609688
Test: start a p2p group with location mode disabled and terminate it.
Change-Id: I855d2ad710df627f23d561ef378eb63fd0894129
1 file changed