MFC 303421,303422,303470-303473

MFC 303421,303422,303470-303473

303421
    hyperv/vmbus: Avoid unnecessary mb()

    Sponsored by:   Microsoft
    Differential Revision:  https://reviews.freebsd.org/D7333

303422
    hyperv/vmbus: Inclusion cleanup

    Sponsored by:   Microsoft
    Differential Revision:  https://reviews.freebsd.org/D7334

303470
    hyperv/vmbus: Reindent function declarations.

    Sponsored by:   Microsoft
    Differential Revision:  https://reviews.freebsd.org/D7344

303471
    hyperv/vmbus: Forward declare static functions

    Sponsored by:   Microsoft
    Differential Revision:  https://reviews.freebsd.org/D7346

303472
    hyperv/vmbus: Move driver glue to the beginning of the files

    Just as most of other drivers do.  And move sysinit function close
    to its SYSINIT.

    Sponsored by:   Microsoft
    Differential Revision:  https://reviews.freebsd.org/D7347

303473
    hyperv/vmbus: Revoke unnecessary exposure of vmbus softc

    Sponsored by:   Microsoft
    Differential Revision:  https://reviews.freebsd.org/D7348

git-svn-id: svn://svn.freebsd.org/base/stable/10@307133 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f