MFC 300565,300567,300568,300570,300571

MFC 300565,300567,300568,300570,300571

300565
    hyperv/vmbus: Move vmbus interrupt counter into vmbus softc

    MFC after:  1 week
    Sponsored by:       Microsoft OSTC
    Differential Revision:      https://reviews.freebsd.org/D6497

300567
    hyperv/vmbus: Pass vmbus_softc and curcpu to hv_vmbus_isr()

    MFC after:  1 week
    Sponsored by:       Microsoft OSTC
    Differential Revision:      https://reviews.freebsd.org/D6498

300568
    hyperv/busdma: Take BUS_DMA_ZERO into account

    MFC after:  1 week
    Sponsored by:       Microsoft OSTC
    Differential Revision:      https://reviews.freebsd.org/D6499

300570
    hyperv/vmbus: Rename local variable and break long lines

    No functional changes.

    MFC after:  1 week
    Sponsored by:       Microsoft OSTC
    Differential Revision:      https://reviews.freebsd.org/D6500

300571
    hyperv/vmbus: Move SynIC setup/teardown from hyperv file to vmbus file

    Avoid unnecessary exposure.

    MFC after:  1 week
    Sponsored by:       Microsoft OSTC
    Differential Revision:      https://reviews.freebsd.org/D6501