MFC 302867-302870
302867
hyperv/vmbus: Remove unused struct Sponsored by: Microsoft OSTC Differential Revision: https://reviews.freebsd.org/D7127
302868
hyperv/vmbus: Function rename Sponsored by: Microsoft OSTC Differential Revision: https://reviews.freebsd.org/D7129
302869
hyperv/vmbus: Remove unused function definition/declaration. Sponsored by: Microsoft OSTC Differential Revision: https://reviews.freebsd.org/D7131
302870
hyperv/vmbus: Use iovec for bufring scatter/gather list. Sponsored by: Microsoft OSTC Differential Revision: https://reviews.freebsd.org/D7134