use standardized register definition in mii.h rather than each
specific driver definition.

no logical change.

ok deraadt@

Add support for the IC Plus IP1001 GigE PHY. From FreeBSD, via Brad.
Tested by jasper@ with a IP1000A PHY to make sure it doesn't break
existing model.

add an initial PHY driver for the IC Plus IP1000A integrated PHY.

From Pyun YongHyeon <yongari at FreeBSD dot org>