Add basic support to the MX31PDK development board, also known as MX31 3DS or MX31 3-stack board (http://www.freescale.com/imx31pdk). Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com> Signed-off-by: sascha Hauer <s.hauer@pengutronix.de>