serial: 8250_of: Remove unneeded ->iotype assignment

If ->iobase is set the default will be UPIO_PORT for ->iotype after
the uart_read_and_validate_port_properties() call. Hence no need
to assign that explicitly.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20250124161530.398361-5-andriy.shevchenko@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/8250/8250_of.c

@@ -110,7 +110,6 @@ static int of_platform_serial_setup(struct platform_device *ofdev,
 	spin_lock_init(&port->lock);
 
 	if (resource_type(&resource) == IORESOURCE_IO) {
-		port->iotype = UPIO_PORT;
 		port->iobase = resource.start;
 	} else {
 		port->mapbase = resource.start;