mii: Add support for Realtek RTL8211F-VD PHY

The RTL8211F-VD is a replacement/upgrade for the RTL8211F. Based on
https://github.com/torvalds/linux/commit/bb726b753f75a4eeda291438f89dfd9b94783569,
the only difference is the lack of the PCR2 register, which FreeBSD
doesn't use.

This fixes autonegotiation problems using the RTL8211F with ukphy(4).
Reviewed by: manu, bz
MFC after: 1 month
Differential Revision: <https://reviews.freebsd.org/D45109