selftest/powerpc: Add PAPR sysfs attributes sniff test
Include a testcase to check if the sysfs files for energy and frequency related have its related attribute files exist and populated Signed-off-by: Pratik R. Sampat <psampat@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20220217105321.52941-3-psampat@linux.ibm.com
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