MFC 305790-305793

MFC 305790-305793

305790
    hyperv/hn: Remove unused softc field

    Sponsored by:   Microsoft
    Differential Revision:  https://reviews.freebsd.org/D7866

305791
    hyperv/hn: Deprecate hn_softc_t

    Sponsored by:   Microsoft
    Differential Revision:  https://reviews.freebsd.org/D7867

305792
    hyperv/hn: Function renaming: hn_ifinit -> hn_init

    No functional changes.

    Sponsored by:   Microsoft
    Differential Revision:  https://reviews.freebsd.org/D7868

305793
    hyperv/hn: Cleanup hn_ioctl.

    Sponsored by:   Microsoft
    Differential Revision:  https://reviews.freebsd.org/D7869

git-svn-id: svn://svn.freebsd.org/base/stable/10@307208 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f