net: sh_eth: CPU dependency code collect to "struct sh_eth_cpu_data"

This improves readability by collecting CPU dependency code.

Signed-off-by: Yoshihiro Shimoda <[email protected]>
Signed-off-by: Nobuhiro Iwamatsu <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

Author: Yoshihiro Shimoda