serial: 8250_bcm2835aux: Use serial8250_em485_supported

bcm2835aux uses em485, fill in rs485_supported accordingly.

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20220606100433.13793-6-ilpo.jarvinen@linux.intel.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>