wifi: mac80211: refactor ieee80211_rx_monitor

Rework the monitor mode interface iteration to get rid of the last_monitor
condition. Preparation for further filtering received monitor packets.

Signed-off-by: Felix Fietkau <nbd@nbd.name>
Link: https://patch.msgid.link/d57d82f109643894325beb9db6da8f001fc533eb.1728462320.git-series.nbd@nbd.name


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