powerpc: Introduce ppc_pci_flags accessors

Currently there are a number of platforms that open code access to
the ppc_pci_flags global variable.  However, that variable is not
present if CONFIG_PCI is not set, which can lead to a build break.

This introduces a number of accessor functions that are defined
to be empty in the case of CONFIG_PCI being disabled.  The
various platform files in the kernel are updated to use these.

Signed-off-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/powerpc/sysdev/fsl_pci.c

@@ -187,7 +187,7 @@ int __init fsl_add_bridge(struct device_node *dev, int is_primary)
 		printk(KERN_WARNING "Can't get bus-range for %s, assume"
 			" bus 0\n", dev->full_name);
 
-	ppc_pci_flags |= PPC_PCI_REASSIGN_ALL_BUS;
+	ppc_pci_add_flags(PPC_PCI_REASSIGN_ALL_BUS);
 	hose = pcibios_alloc_controller(dev);
 	if (!hose)
 		return -ENOMEM;
@@ -300,7 +300,7 @@ int __init mpc83xx_add_bridge(struct device_node *dev)
 		       " bus 0\n", dev->full_name);
 	}
 
-	ppc_pci_flags |= PPC_PCI_REASSIGN_ALL_BUS;
+	ppc_pci_add_flags(PPC_PCI_REASSIGN_ALL_BUS);
 	hose = pcibios_alloc_controller(dev);
 	if (!hose)
 		return -ENOMEM;

arch/powerpc/sysdev/grackle.c

@@ -57,7 +57,7 @@ void __init setup_grackle(struct pci_controller *hose)
 {
 	setup_indirect_pci(hose, 0xfec00000, 0xfee00000, 0);
 	if (machine_is_compatible("PowerMac1,1"))
-		ppc_pci_flags |= PPC_PCI_REASSIGN_ALL_BUS;
+		ppc_pci_add_flags(PPC_PCI_REASSIGN_ALL_BUS);
 	if (machine_is_compatible("AAPL,PowerBook1998"))
 		grackle_set_loop_snoop(hose, 1);
 #if 0	/* Disabled for now, HW problems ??? */