[POWERPC] Clear pci_probe_only on 64 bits PowerMac

It should now be safe to re-assign unassigned resources on 64 bits PowerMac
machines (G5s).  This clears pci_probe_only on those.
Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: NPaul Mackerras <paulus@samba.org>

arch/powerpc/platforms/powermac/pci.c

@@ -1041,8 +1041,8 @@ void __init pmac_pci_init(void)
 	}
 	/* pmac_check_ht_link(); */
 
-	/* Tell pci.c to not use the common resource allocation mechanism */
-	pci_probe_only = 1;
+	/* We can allocate missing resources if any */
+	pci_probe_only = 0;
 
 #else /* CONFIG_PPC64 */
 	init_p2pbridge();