sh_eth: Add asm/cacheflush.h

Add include asm/cacheflush.h,  because declaration of __flush_purge_region
moved to asm/cacheflush.h.

Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/sh_eth.c b/drivers/net/sh_eth.c
index f49d0800..528b912 100644
--- a/drivers/net/sh_eth.c
+++ b/drivers/net/sh_eth.c
@@ -30,6 +30,7 @@
 #include <linux/phy.h>
 #include <linux/cache.h>
 #include <linux/io.h>
+#include <asm/cacheflush.h>
 
 #include "sh_eth.h"