net: wwan: t7xx: Change PM_AUTOSUSPEND_MS to 5000

Because optimizing the power consumption of t7XX,
change auto suspend time to 5000.

The Tests uses a script to loop through the power_state
of t7XX.
(for example: /sys/bus/pci/devices/0000\:72\:00.0/power_state)

* If Auto suspend is 20 seconds,
  test script show power_state have 0~5% of the time was in D3 state
  when host don't have data packet transmission.

* Changed auto suspend time to 5 seconds,
  test script show power_state have 50%~80% of the time was in D3 state
  when host don't have data packet transmission.

We tested Fibocom FM350 and our products using the t7xx and they all
benefited from this.

Signed-off-by: Jack Wu <[email protected]>
Reviewed-by: Andrew Lunn <[email protected]>
Reviewed-by: Sergey Ryazanov <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>

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