wifi: mac80211: Cleanup sta TXQs on flush

Drop the sta TXQs on flush when the drivers is not supporting
flush.

ieee80211_set_disassoc() tries to clean up everything for the sta.
But it ignored queued frames in the sta TX queues when the driver
isn't supporting the flush driver ops.

Signed-off-by: Alexander Wetzel <Alexander@wetzel-home.de>
Link: https://patch.msgid.link/20250204123129.9162-1-Alexander@wetzel-home.de


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