wifi: mac80211: add support for the monitor SKIP_TX flag

Do not pass locally sent packets to monitor interfaces with this flag set.
Skip processing tx packets on the status call entirely if no monitor
interfaces without this flag are present.

Signed-off-by: Felix Fietkau <nbd@nbd.name>
Link: https://patch.msgid.link/c327bb57ef8dadaa6a0e8e4dc2f5f99ae8123e6c.1728462320.git-series.nbd@nbd.name


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