wifi: mac80211: Add debugfs entry to report dormant links

Add debugfs entry to report dormant (valid but disabled) links.

Signed-off-by: Ilan Peer <ilan.peer@intel.com>
Signed-off-by: Gregory Greenman <gregory.greenman@intel.com>
Link: https://lore.kernel.org/r/20230611121219.7fa5f022adfb.Iff6fa3e1a3b00ae726612f9d5a31f7fe2fcbfc68@changeid


Signed-off-by: Johannes Berg <johannes.berg@intel.com>