[Bug 1946434] [NEW] SRU: enable RTD3 only on laptops and decouple on-demand with RTD3

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[Impact]

 * User can't use GPU for other purpose (eg: deep-learning) if RTD3 is not supported
 * According to Nvidia README, the RTD3 doesn't support on non-laptop machine

[Test Plan]

 * With Nvidia driver installed
 * On non-laptop machine. Can set GPU mode to on-demand
 * On laptop with GPU in runtime PM support list. Set GPU mode to on-demand and Nvidia driver is loaded with "NVreg_DynamicPowerManagement=0x02"

[Where problems could occur]

 * With GPU supported RTD3 not able enable runtime PM on non-laptop. But
based on the Nvidia README, this case shall not happened.

[Other Info]

** Affects: oem-priority
     Importance: High
     Assignee: Dirk Su (dirksu)
         Status: New

** Affects: nvidia-prime (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: oem-priority originate-from-1942788 originate-from-1942789 patch
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SRU: enable RTD3 only on laptops and decouple on-demand with RTD3
https://bugs.launchpad.net/bugs/1946434
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