serial: core: constify struct uart_port {name} field

Don't allow modifications of port name. It's serial core's business only.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

include/linux/serial_core.h

@@ -247,7 +247,7 @@ struct uart_port {
 	unsigned char		suspended;
 	unsigned char		irq_wake;
 	unsigned char		unused[2];
-	char			*name;			/* port name */
+	const char		*name;			/* port name */
 	struct attribute_group	*attr_group;		/* port specific attributes */
 	const struct attribute_group **tty_groups;	/* all attributes (serial core use only) */
 	struct serial_rs485     rs485;