Merge branch 'dsa-lan9303-IGMP-handling'

Egil Hjelmeland says:

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net: dsa: lan9303: IGMP handling

Set up the HW switch to trap IGMP packets to CPU port.
And make sure skb->offload_fwd_mark is cleared for incoming IGMP packets.

skb->offload_fwd_mark calculation is a candidate for consolidation into the
DSA core. The calculation can probably be more polished when done at a point
where DSA has updated skb.
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Signed-off-by: David S. Miller <davem@davemloft.net>