Merge branch 'renesas-read-mac'

Sergei Shtylyov says:

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Renesas: read MAC address registers only once

Here's 2 patches against DaveM's 'net-next.git' repo. Here we optimize
the MAC address register reading (left over from a bootloader).

[1/2] ravb: read MAC address registers only once
[2/2] sh_eth: read MAC address registers only once
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Signed-off-by: David S. Miller <davem@davemloft.net>