net: wwan: t7xx: Add NAPI support

Replace the work queue based RX flow with a NAPI implementation
Remove rx_thread and dpmaif_rxq_work.
Enable GRO on RX path.
Introduce dummy network device. its responsibility is
    - Binds one NAPI object for each DL HW queue and acts as
      the agent of all those network devices.
    - Use NAPI object to poll DL packets.
    - Helps to dispatch each packet to the network interface.

Signed-off-by: Haijun Liu <[email protected]>
Co-developed-by: Sreehari Kancharla <[email protected]>
Signed-off-by: Sreehari Kancharla <[email protected]>
Signed-off-by: Chandrashekar Devegowda <[email protected]>
Acked-by: Ricardo Martinez <[email protected]>
Acked-by: M Chetan Kumar <[email protected]>
Reviewed-by: Ilpo Järvinen <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

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