net: sh_eth: Fix checkpatch warning

Fix minor checkpatch warning about udelay(3000) being too long
and should be replaced by mdelay(3).

Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Cc: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
Cc: Joe Hershberger <joe.hershberger@ni.com>
diff --git a/drivers/net/sh_eth.c b/drivers/net/sh_eth.c
index 6863aec..1864c89 100644
--- a/drivers/net/sh_eth.c
+++ b/drivers/net/sh_eth.c
@@ -179,7 +179,7 @@
 	return ret;
 #else
 	sh_eth_write(port_info, sh_eth_read(port_info, EDMR) | EDMR_SRST, EDMR);
-	udelay(3000);
+	mdelay(3);
 	sh_eth_write(port_info,
 		     sh_eth_read(port_info, EDMR) & ~EDMR_SRST, EDMR);