net: sh: Renesas SH7763 Ethernet device support

Renesas SH7763 has 2 channel Ethernet device.
This is 10/100/1000 Base support.
But this patch check 10/100 Base only.

Signed-off-by: Nobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com>
Signed-off-by: Ben Warren <biggerbadderben@gmail.com>