Merge branch 'cpsw_macid'

Tony Lindgren says:

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Changes to cpsw and davinci_emac for getting MAC address

Here are a few patches to add common code for cpsw and davinci_emac for
getting the MAC address. Looks like we can also now add code to get the
MAC address on 3517 but in a slightly different way.
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Signed-off-by: David S. Miller <davem@davemloft.net>