On mx53_loco only UART1 is used and its signals go to connector J16.

Remove UART2 and UART3 as they are not used on this board.
Signed-off-by: NFabio Estevam <fabio.estevam@freescale.com>
Acked-by: NRichard Zhao <richard.zhao@freescale.com>
Signed-off-by: NSascha Hauer <s.hauer@pengutronix.de>