rewrite the serial port handling to manipulate the hardware directly

rather than relying on calls into the bios to work.

this is a result of me getting pissed off with solaris and linux
being able to cope the serial bios redirection on dracs, iloms, and
ilos. trying to do the same thing with openbsds boot loader caused
weird behaviour like machine hangs or no visible output. talking
to the serial chips directly is more reliable.

tested by many

ok sthen@ deraadt@

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