mac80211 incorrectly processes A-MSDUs contained in A-MPDU frames. This
results in dropped packets and severely impacted throughput.
As a workaround, don't indicate support for A-MSDUs contained in
A-MPDUs. This improves throughput over mesh links by factor 10.
Ref: https://github.com/openwrt/mt76/issues/450
Signed-off-by: David Bauer <mail@david-bauer.net>
