p2p: remove all p2p groups when p2p dev interface is removed.

The p2p dev interface is not a top interface, but a child of
the global interface. When this interface is removed,
p2p groups will not be removed.
To avoid leaking p2p groups, p2p groups should be removed when
p2p dev interface is removed.

Bug: 195618672
Test: create a group and remove the top interface by wpa_cli command.
Change-Id: Ia3e0c0512314ae55dee9a81661f51eee6e8e3428
1 file changed