net: sh_eth: add cache handling
Some CPU needs cache handling. So this patch add the config of CONFIG_SH_ETHER_CACHE_WRITEBACK, and it calls wback function. Signed-off-by: NYoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> Signed-off-by: NNobuhiro Iwamatsu <iwamatsu@nigauri.org>
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