Support conc_pref when use_p2p_group_interface=0

The original implementation of wpas_p2p_handle_frequency_conflicts()
only works correctly when P2P groups use a separate interface
(i.e. use_p2p_group_interface=1).  Update the implementation so
that it also works when the device interfaces is used
(i.e. use_p2p_group_interface=0).

Bug: 7290509
Change-Id: Icbc489125c5b7bd6e174d6aecd53555cdc9ad99d
1 file changed