UPSTREAM: mac80211-hwsim: Provide multicast event for HWSIM_CMD_NEW_RADIO

When adding new radio via HWSIM_CMD_NEW_RADIO then listeners on the
multicast group "config" are informed.

While at it, refactor the configuration parameters to be able to
pass them directly and have fewer function arguments.

Signed-off-by: Jukka Rissanen <jukka.rissanen@linux.intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
(cherry picked from commit 62759361)
Bug: 70214720
Change-Id: If3c11f25928e6d177aae057cb75cb1348a2e30d8
Signed-off-by: Alistair Strachan <astrachan@google.com>