Merge branch 'cpsw-allow-PTP-224.0.0.107-to-be-timestamped'

Ivan Khoronzhuk says:

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allow PTP 224.0.0.107 to be timestamped

Allows packets with 224.0.0.107 mcas address for PTP packets to be timestamped.
Only for cpsw version > v1.15.
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Signed-off-by: David S. Miller <davem@davemloft.net>