[PATCH i-g-t, v4] tests/intel/xe_pm: Add tests for suspend without display

[Gustavo Sousa]

Quoting Gupta, Anshuman (2024-08-27 06:29:06-03:00)

>For s0ix DC9 is the pre-requisite rather then DC6, DC9 does not have any depende
>ncy on DMC.

Maybe DC6 and DC9 are pre-requisites for different S0ix sub-states?

- BSpec 68851 says that DC6 is requirement for S0ix.
- BSpec 68857 says that DC9 supports S0ix with more power savings than
  DC6.

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Gustavo Sousa