add board_eth_init() for sh7785lcr board

Fix the problem that cannot work RTL8169 on sh7785lcr board.

Signed-off-by: Yoshihiro Shimoda <shimoda.yoshihiro@renesas.com>
diff --git a/board/sh7785lcr/sh7785lcr.c b/board/sh7785lcr/sh7785lcr.c
index 5b9c403..66b21f8 100644
--- a/board/sh7785lcr/sh7785lcr.c
+++ b/board/sh7785lcr/sh7785lcr.c
@@ -21,6 +21,7 @@
 #include <asm/io.h>
 #include <asm/processor.h>
 #include <asm/pci.h>
+#include <netdev.h>
 
 int checkboard(void)
 {
@@ -49,3 +50,7 @@
 	pci_sh7780_init(&hose);
 }
 
+int board_eth_init(bd_t *bis)
+{
+	return pci_eth_init(bis);
+}