wifi: cfg80211: reject HTC bit for management frames

Management frames sent by userspace should never have the
order/HTC bit set, reject that. It could also cause some
confusion with the length of the buffer and the header so
the validation might end up wrong.

Link: https://patch.msgid.link/20250718202307.97a0455f0f35.I1805355c7e331352df16611839bc8198c855a33f@changeid


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