hyperv/hn: Don't abuse hn_{tx,rx}_ring_inuse.
Just in case, the # of TX/RX rings is changed upon synthetic parts
re-attach.
MFC after: 1 week
Sponsored by: Microsoft
Differential Revision: https://reviews.freebsd.org/D8520
hyperv/hn: Don't abuse hn_{tx,rx}_ring_inuse. Tags None Referenced Files None Subscribers None
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