serial: 8250_fintek: Remove serial_rs485 sanitization

Serial core handles serial_rs485 sanitization and copying rs485 struct.

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20220606100433.13793-27-ilpo.jarvinen@linux.intel.com


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