Cancel the testcase as maximum mode is not supported for ppc!

[Anushree-Mathur]

Added a condition to cancel a testcase if machine is ppc64 or ppc64le and cpu_mode is maximum as this mode is not supported for power architecture.

Signed-off-by: Anushree-Mathur [email protected]

Summary by CodeRabbit

• Tests
  • Tests now automatically cancel on Power (PPC) systems when CPU mode is set to "maximum", stopping execution early (before CPU XML creation) to avoid running unsupported configurations on that hardware.

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