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hyperv/hn: Don't abuse hn_{tx,rx}_ring_inuse.

Description

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

Details