MOXA PCIe RS422/RS485 boards will not function by default because of the
initial default serial interface of all MOXA PCIe boards is set to RS232.
This patch fixes the problem above by setting the initial default serial
interface to RS422 for those MOXA RS422/RS485 PCIe boards.
Signed-off-by: Crescent CY Hsieh <crescentcy.hsieh@xxxxxxxx>