Change in coreboot[master]: soc/amd/cezanne: Disable legacy DMA IO ports

[Raul Rangel (Code Review)]

Attention is currently required from: Jason Glenesk, Marshall Dawson, Paul Menzel, Angel Pons, Felix Held.
Raul Rangel has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/51076 )

Change subject: soc/amd/cezanne: Disable legacy DMA IO ports
......................................................................

Patch Set 2:

(1 comment)

Commit Message:

https://review.coreboot.org/c/coreboot/+/51076/comment/26d302c3_a7b8f795 
PS2, Line 10: ports.
> the only two things that still used legacy ISA DMA were the floppy drive controller and the parallel […]

Ports 0x80-0x83 were not being router to the DMA controller either. So I'm not sure how functional it would even be. I think we should keep it disabled unless someone finds a specific reason to keep it enabled.