ixl: Report SR-IOV VF status

Expose cached per-VF configuration through the iflib VF status method.
Report mailbox initialization and the negotiated virtual-channel API, MAC
address, access or trunk VLAN mode, queue resources, administrator policy,
PF traffic permission, and fault containment.

Expose per-VF malicious-driver isolation and cumulative transmit and
receive event counts through a versioned driver.ixl extension.

Track successful PCI IOV attachment separately from hardware capability.
This lets a successfully attached but unconfigured PF return an empty
snapshot without claiming support when PCI IOV registration was
unavailable.

The query uses driver-cached state and does not issue AdminQ requests or
read device registers.

Sponsored by:	BBOX.io

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