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>