net: implement threaded-able napi poll loop support

This patch allows running each napi poll loop inside its own
kernel thread.
The kthread is created during netif_napi_add() if dev->threaded
is set. And threaded mode is enabled in napi_enable(). We will
provide a way to set dev->threaded and enable threaded mode
without a device up/down in the following patch.

Once that threaded mode is enabled and the kthread is
started, napi_schedule() will wake-up such thread instead
of scheduling the softirq.

The threaded poll loop behaves quite likely the net_rx_action,
but it does not have to manipulate local irqs and uses
an explicit scheduling point based on netdev_budget.

Co-developed-by: Paolo Abeni <[email protected]>
Signed-off-by: Paolo Abeni <[email protected]>
Co-developed-by: Hannes Frederic Sowa <[email protected]>
Signed-off-by: Hannes Frederic Sowa <[email protected]>
Co-developed-by: Jakub Kicinski <[email protected]>
Signed-off-by: Jakub Kicinski <[email protected]>
Signed-off-by: Wei Wang <[email protected]>
Reviewed-by: Alexander Duyck <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

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