Merge branch 'sh_eth-R8A77980-GEther-support'

Sergei Shtylyov says:

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Add Renesas R8A77980 GEther support

Here's a set of 3 patches against DaveM's 'net-next.git' repo. They (gradually)
add R8A77980 GEther support to the 'sh_eth' driver, starting with couple new
register bits/values introduced with this chip, and ending with adding a new
'struct sh_eth_cpu_data' instance connected to the new DT "compatible" prop
value...
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Signed-off-by: David S. Miller <davem@davemloft.net>