Staring with SEABIOS_HPPA_VERSION 6 the serial ports are now emulated as
on physical hardware, with LASI UART being serial port #0 and DINO UART
as serial port #1. On older versions those ports were swapped.

This SeaBIOS-hppa fix is needed to allow fixing the qemu serial
pass-through from host to guest.

Signed-off-by: Helge Deller <deller@gmx.de>