Set all of the "optimum performance" PHY registers for the 15D parts as well as the 15C since it seems to be required in practice.  The Linux natsemi.c driver mostly does this as well.
Set all of the "optimum performance" PHY registers for the 15D parts as
well as the 15C since it seems to be required in practice.  The Linux
natsemi.c driver mostly does this as well.

PR:		kern/112179
Submitted by:	Mark Willson  mark - hydrus org uk
MFC after:	1 week

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