ARM: board-mx51_babbage: Fix UART2 registration

On MX51 Babbage board the RTS/CTS pins are not used on UART2 port.

Fix the registration of this port.
Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

arch/arm/mach-mx5/board-mx51_babbage.c

@@ -347,7 +347,7 @@ static void __init mx51_babbage_init(void)
 					ARRAY_SIZE(mx51babbage_pads));
 
 	imx51_add_imx_uart(0, &uart_pdata);
-	imx51_add_imx_uart(1, &uart_pdata);
+	imx51_add_imx_uart(1, NULL);
 	imx51_add_imx_uart(2, &uart_pdata);
 
 	babbage_fec_reset();