wifi: mac80211: clear vif drv_priv after remove_interface when stopping

Avoid reusing stale driver data when an interface is brought down and up
again. In order to avoid having to duplicate the memset in every single
driver, do it here.

Signed-off-by: Felix Fietkau <nbd@nbd.name>
Link: https://patch.msgid.link/20240704130947.48609-1-nbd@nbd.name


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