bhyve nvme: Fix Identify Namespace, NSID=ffffffff

If the NVMe Controller doesn't support Namespace Management, it should
return "Invalid Namespace or Format" when the Host request Identify
Namespace with the global NSID value.

Fixes UNH IOL 16.0 Test 9.1, Case 6

Reviewed by: imp, allanjude
Tested by: jason@tubnor.net
MFC after: 1 month
Differential Revision: https://reviews.freebsd.org/D33578