MFC 298039,298042
298039
hyperv/vmbus: Put multi-channel offer logging under bootverbose Suggested by: Dexuan Cui <decui microsoft com> MFC after: 1 week Sponsored by: Microsoft OSTC
298042
hyperv/hn: Hide ring to channel linkage message under bootverbose Suggested by: Dexuan Cui <decui microsoft com> MFC after: 1 week Sponsored by: Microsoft OSTC