[coreboot] Fintek f71882

[Alec Wright]

I've been looking through the datasheets for my superio (f71882f, not
officially supported in coreboot) and the .h and _early_serial.c files
for the f71805f (supported in coreboot). It looks like my superio
might be compatible. (same addresses/commands etc). Is it worth a try?
My COM1 port's fried and my COM2 port doesnt seem to work, although I
think the latter might be an issue with the BIOS disabling it. If
that's the case, how easy would it be to get a basic coreboot image on
my board with serial debugging? RAM etc can come later.
It looks like EHCI debug is possible on my motherboard, but at $90
each, I can't really afford a debugger - my motherboard cost half
that.