Restore original MDC speed control register value after MAC reset
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Authored by vezhlys_gmail.com on Oct 26 2021, 10:01 PM.

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Summary

A patch for PR/258580. On some Vortex86 SoCs MDC speed control register may
have non default value, which is set to default one after MAC reset. Because of
this some PHY registers values become unaccesible and PHY link can't be setup.
Original MDC value needs to restored to circumvent the issue. The patch was
originally applied and tested on NetBSD, later on Linux as well. Submitting
same patch to FreeBSD.