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Revert "mccomphy: add support for YT8531"

Description

Revert "mccomphy: add support for YT8531"

The new code makes use of FDT/OFW types and interfaces, and obviously
fails to build on amd64. Revert to fix.

Pointy-hat-to: mhorne

This reverts commit e69623451ea62d2c3c76e0d0e775aa3f7317f2eb.