powerpc/pseries: Cleanup best_energy_hcall detection
Currently we search for the best_energy hcall using a custom function. Move this to using the firmware_feature_table. Signed-off-by: NMichael Neuling <mikey@neuling.org> cc: Vaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com> cc: Linux PPC dev <linuxppc-dev@ozlabs.org> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
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