powerpc/powernv: Check PHB type in advance
The patch checks PHB type a bit early to save a bit cycles for P7 because we don't support M64 for P7IOC no matter what OPAL firmware we have. Signed-off-by: NGavin Shan <gwshan@linux.vnet.ibm.com> Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
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