serial: mpc52xx: constify uart_ops structures

These uart_ops structures are only stored in the ops field of a
uart_port structure and this fields is const, so the uart_ops
structures can also be const.

Done with the help of Coccinelle.
Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/mpc52xx_uart.c

@@ -1347,7 +1347,7 @@ mpc52xx_uart_verify_port(struct uart_port *port, struct serial_struct *ser)
 }
 
 
-static struct uart_ops mpc52xx_uart_ops = {
+static const struct uart_ops mpc52xx_uart_ops = {
 	.tx_empty	= mpc52xx_uart_tx_empty,
 	.set_mctrl	= mpc52xx_uart_set_mctrl,
 	.get_mctrl	= mpc52xx_uart_get_mctrl,