MFC r303115:
urtwn: fix A-MSDU tx aggregation when encryption is used.
Clear unused (undocumented) CAM bytes while setting a key;
without that, hardware does weird things when A-MSDU bit in QoS header
is set.
Tested with RTL8188CUS (AP) -> RTL8188EU (STA) (A-MSDU transmit).
Reported by: many
Approved by: re (gjb)
Obtained from: https://github.com/s3erios/urtwm
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