UPSTREAM: mac80211: support creating wiphy w/out creating wlanX

This will be helpful when using the mac80211_hwsim
wiphys and automated testing.  Let user create the
vifs as needed, and named as expected.

Signed-off-by: Ben Greear <greearb@candelatech.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
(cherry picked from commit e27513fb)
Bug: 70214720
Change-Id: I85c94855b3e43ca75ba603cb70f968a87fe5c24a
Signed-off-by: Alistair Strachan <astrachan@google.com>