mac80211: set info->control.hw_key for encap offload packets

This is needed for drivers that don't do the key lookup themselves

Signed-off-by: Felix Fietkau <nbd@nbd.name>
Link: https://lore.kernel.org/r/20200908123702.88454-5-nbd@nbd.name


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