tsnep: Link queues to NAPIs

Use netif_queue_set_napi() to link queues to NAPI instances so that they
can be queried with netlink.

$ ./tools/net/ynl/cli.py --spec Documentation/netlink/specs/netdev.yaml \
                         --dump queue-get --json='{"ifindex": 11}'
[{'id': 0, 'ifindex': 11, 'napi-id': 9, 'type': 'rx'},
 {'id': 1, 'ifindex': 11, 'napi-id': 10, 'type': 'rx'},
 {'id': 0, 'ifindex': 11, 'napi-id': 9, 'type': 'tx'},
 {'id': 1, 'ifindex': 11, 'napi-id': 10, 'type': 'tx'}]

Additionally use netif_napi_set_irq() to also provide NAPI interrupt
number to userspace.

$ ./tools/net/ynl/cli.py --spec Documentation/netlink/specs/netdev.yaml \
                         --do napi-get --json='{"id": 9}'
{'defer-hard-irqs': 0,
 'gro-flush-timeout': 0,
 'id': 9,
 'ifindex': 11,
 'irq': 42,
 'irq-suspend-timeout': 0}

Providing information about queues to userspace makes sense as APIs like
XSK provide queue specific access. Also XSK busy polling relies on
queues linked to NAPIs.

Signed-off-by: Gerhard Engleder <gerhard@engleder-embedded.com>
Reviewed-by: Alexander Lobakin <aleksander.lobakin@intel.com>
Link: https://patch.msgid.link/20250110223939.37490-1-gerhard@engleder-embedded.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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