serial: owl: 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/owl-uart.c

@@ -473,7 +473,7 @@ static void owl_uart_config_port(struct uart_port *port, int flags)
 	}
 }
 
-static struct uart_ops owl_uart_ops = {
+static const struct uart_ops owl_uart_ops = {
 	.set_mctrl = owl_uart_set_mctrl,
 	.get_mctrl = owl_uart_get_mctrl,
 	.tx_empty = owl_uart_tx_empty,