Merge branch 'dsa-headroom'

Per Forlin says:

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net: dsa: Make sure there is headroom for tag

Sorry for re-posting yet another time....
I manage to include multiple email-senders and forgot to include cover-letter.
Let's hope everyhthing is in order this time.

Fix two tag drivers to make sure there is headroom for the tag data.
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Signed-off-by: David S. Miller <davem@davemloft.net>