• Also probe DP83865, which is an is an ultra low power version of the DP83861 and DP83891.
• Reset the PHY during attach so it's in a known state.
• Add a comment describing why we hardwire 10baseT support in the BMSR.
• Always explicitly set IFM_HDX for half-duplex. [1]

Obtained from: OpenBSD [1]
MFC after: 2 weeks