cfg80211: Simplify the handling of regulatory indoor setting

Directly update the indoor setting without wrapping it as
a regulatory request, to simplify the processing.

Acked-by: Luis R. Rodriguez <mcgrof@suse.com>
Signed-off-by: Ilan Peer <ilan.peer@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>