serial: m32r_sio: 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: NJulia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/m32r_sio.c

@@ -854,7 +854,7 @@ m32r_sio_verify_port(struct uart_port *port, struct serial_struct *ser)
 	return 0;
 }
 
-static struct uart_ops m32r_sio_pops = {
+static const struct uart_ops m32r_sio_pops = {
 	.tx_empty	= m32r_sio_tx_empty,
 	.set_mctrl	= m32r_sio_set_mctrl,
 	.get_mctrl	= m32r_sio_get_mctrl,