net: ena: Support persistent per-NAPI config.

Let's pass the queue index to netif_napi_add_config() to preserve
per-NAPI config.

Test:

Set 100 to defer-hard-irqs (default is 0) and check the value after
link down & up.

  $ cat /sys/class/net/enp39s0/napi_defer_hard_irqs
  0

  $ ./tools/net/ynl/pyynl/cli.py --spec Documentation/netlink/specs/netdev.yaml \
    --dump napi-get --json='{"ifindex": 2}'
  [{'defer-hard-irqs': 0,
    'gro-flush-timeout': 0,
    'id': 65,
    'ifindex': 2,
    'irq': 29,
    'irq-suspend-timeout': 0}]

  $ sudo ./tools/net/ynl/pyynl/cli.py --spec Documentation/netlink/specs/netdev.yaml \
    --do napi-set --json='{"id": 65, "defer-hard-irqs": 100}'

  $ sudo ip link set enp39s0 down && sudo ip link set enp39s0 up

Without patch:

  $ ./tools/net/ynl/pyynl/cli.py --spec Documentation/netlink/specs/netdev.yaml \
    --dump napi-get --json='{"ifindex": 2}'
  [{'defer-hard-irqs': 0,  <------------------- Reset to 0
    'gro-flush-timeout': 0,
    'id': 66,  <------------------------------- New ID
    'ifindex': 2,
    'irq': 29,
    'irq-suspend-timeout': 0}]

With patch:

  $ ./tools/net/ynl/pyynl/cli.py --spec Documentation/netlink/specs/netdev.yaml \
    --dump napi-get --json='{"ifindex": 2}'
  [{'defer-hard-irqs': 100,  <--------------+-- Preserved
    'gro-flush-timeout': 0,                 |
    'id': 65,  <----------------------------'
    'ifindex': 2,
    'irq': 29,
    'irq-suspend-timeout': 0}]

Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Reviewed-by: Joe Damato <jdamato@fastly.com>
Reviewed-by: Arthur Kiyanovski <akiyano@amazon.com>
Link: https://patch.msgid.link/20250407164802.25184-1-kuniyu@amazon.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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