parisc: SEABIOS_HPPA_VERSION 6

Fixes the serial port emulation

Qemu versions which request a SEABIOS_HPPA_VERSION < 6 have the bug that
they use the DINO UART instead of the LASI UART as serial port #0.

Staring with SEABIOS_HPPA_VERSION 6 the serial ports are now emulated as
on physical hardware, with LASI UART being serial port #0.

This patch adds a compat patch, which will use the DINO UART port
for console I/O if it detects that qemu requests a SEABIOS_HPPA_VERSION
< 6.

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