qlnx: Report SR-IOV VF status

[kbowling]

Summary

Retain the PF-known MAC and allocated transmit and receive queue counts
for each VF and expose them through the PF ifnet.  Sum queues across all
hardware functions rather than reporting only the first one.

Publish and snapshot the VF cache under the existing hardware lock.
Unpublish it before hardware teardown, and invalidate queue-allocation
knowledge when error recovery releases the underlying VF resources.

Initialize the cache, release it on failed initialization, and reject an
out-of-range VF index instead of continuing into the array.

[kbowling]

This is a basic implementation, someone more familiar with the driver may look at the nvlist schema and https://reviews.freebsd.org/D58739 which demonstrates driver extensions.

[kbowling]

Update to committed netlink API