- pass the tag to DSA via metadata dst
- disabled on 7986 for now, since it's not working yet
- disabled if a MAC is enabled that does not use DSA

This improves performance by bypassing the DSA tag driver and avoiding extra
skb data mangling
Signed-off-by: NFelix Fietkau <nbd@nbd.name>
Signed-off-by: NJakub Kicinski <kuba@kernel.org>