MFC: 1.21
MFC: 1.21

Set MIIF_HAVE_FIBER and add IFM_100_FX media when the AC_MCTL_FX_SEL
and thus the FX_DIS pin indicates fibre media. This is part 1/2 of
adding support for the 100baseFX interface/port of AT-2700 series
adaptors.

Idea from:	NetBSD

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