pc386 BSP documentation tweaks.

[Karel Gardas]

Hello,

attached are three patches:

    pc386 BSP: add runtime options for debugging and move few lines
around for better context.
    pc386 BSP: add a note about default baud rate for console over UART/COM.
    pc386 BSP: remove USE_COM1_AS_CONSOLE reference, the option is long
time gone.

please review/commit or request change(s).

The patches are based on my playing with BSP and seeing documentation
limitations or missing info bits...

Thanks,
Karel
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