drivers/serial/mpc52xx_uart.c: Use UPIO_MEM rather than SERIAL_IO_MEM

As in the commit 9b4a1617, use UPIO_MEM
rather than SERIAL_IO_MEM.  Both have the same value.

The semantic patch that makes this change is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@has_sc@
@@

#include <linux/serial_core.h>

@depends on has_sc@
@@

- SERIAL_IO_MEM
+ UPIO_MEM
// </smpl>
Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>

drivers/serial/mpc52xx_uart.c

@@ -705,7 +705,7 @@ mpc52xx_uart_verify_port(struct uart_port *port, struct serial_struct *ser)
 		return -EINVAL;
 
 	if ((ser->irq != port->irq) ||
-	    (ser->io_type != SERIAL_IO_MEM) ||
+	    (ser->io_type != UPIO_MEM) ||
 	    (ser->baud_base != port->uartclk)  ||
 	    (ser->iomem_base != (void *)port->mapbase) ||
 	    (ser->hub6 != 0))