net: sh_eth: add support R8A7740
The R8A7740 has a Gigabit Ethernet MAC. This patch supports it. Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> Tested-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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