parisc: SEABIOS_HPPA_VERSION 6

* Fixed SeaBIOS serial port support.

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.

Compat support is included: DINO UART port will be used for console I/O
if it detects that qemu requests a SEABIOS_HPPA_VERSION < 6.
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