Do not request P2P if user declined interface conflict dialog

P2P iface requests may prompt the user to accept/decline. We should avoid prompting the user twice by not making any additional P2P iface requests after the user declines (i.e. device becomes unavailable).

Bug: 243436630
Test: enable iface creation dialog and turn on STA + AP, verify dialog
does not reappear after user reject in P2P Settings

Change-Id: I6fdda273d898c1d456a1f39d90b1257c8ff4de15