ice: Report SR-IOV VF status

[kbowling]

Summary

Report the VF MAC, allocated queues, trunk VLAN mode, VLAN capacity,
and configured MAC, VLAN, spoof-check, and promiscuous-mode policy
through iflib.  Track whether the VF completed its resource handshake
since the last reset.

Expose mirror configuration and active hardware rules through a
versioned driver.ice extension.  Keep the namespace schema local to the
driver and render scalar extension fields generically in ifconfig -v.
Future extensions therefore need no changes to common network headers or
the formatter.

The iflib context lock already serializes the VF and VSI lifetime, while
the policy flags are safe for the mailbox path to read atomically.