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In order to support MLD, the key API is also changing to have
station masks instead of just the station ID etc. Change the
driver to support this, and add the new code in a new file so
it's more clearly separated.

For now this isn't separated at the mac80211 ops level, which
we wanted to do, but we're calling these functions in a place
when pre-start keys are installed in iwl_mvm_start_ap_ibss(),
and the function has some glue logic to mac80211. We may want
to change that later.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Gregory Greenman <gregory.greenman@intel.com>
Link: https://lore.kernel.org/r/20221102165239.ed9ccd814abc.Iacc7360de68807fbac19e5b67c86504b39cc15df@changeid