MFC 302636-302638
302636
hyperv/vmbus: Move channel map to vmbus_softc Sponsored by: Microsoft OSTC Differential Revision: https://reviews.freebsd.org/D6982
302637
hyperv/vmbus: Remove needed bits Sponsored by: Microsoft OSTC Differential Revision: https://reviews.freebsd.org/D7002
302638
hyperv/vmbus: Destroy channel list lock upon attach failure and detach. Sponsored by: Microsoft OSTC Differential Revision: https://reviews.freebsd.org/D7003