MFC: r308643, r312427, r312641, r322986

MFC: r308643, r312427, r312641, r322986

- Update WOL support for newer em(4) devices. [1]
- Add support for Kaby Lake generation i219 (4) and i219 (5) devices.
- Enable WOL features also for the igb(4) class of devices. [1]
- Don't set any WOL enabling hardware bits if WOL isn't requested
  according to the enabled interface capability bits.

PR:		208343 [1]
Submitted by:	Kaho Tashikazu <kaho@elam.kais.kyoto-u.ac.jp> [1]
Approved by:	re (kib)

git-svn-id: svn://svn.freebsd.org/base/stable/10@323080 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f