powerpc/pnv: Fix "compatible" property for P8 PHB

The property should be "ibm,power8-pciex", not "ibm,p8-pciex". The latter
was changed in FW because it was inconsistent with the rest of the nodes.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c
index 8c6c9cf..97b08fc 100644
--- a/arch/powerpc/platforms/powernv/pci-ioda.c
+++ b/arch/powerpc/platforms/powernv/pci-ioda.c
@@ -1089,7 +1089,7 @@
 	/* Detect specific models for error handling */
 	if (of_device_is_compatible(np, "ibm,p7ioc-pciex"))
 		phb->model = PNV_PHB_MODEL_P7IOC;
-	else if (of_device_is_compatible(np, "ibm,p8-pciex"))
+	else if (of_device_is_compatible(np, "ibm,power8-pciex"))
 		phb->model = PNV_PHB_MODEL_PHB3;
 	else
 		phb->model = PNV_PHB_MODEL_UNKNOWN;