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>
diff --git a/arch/powerpc/sysdev/fsl_pci.c b/arch/powerpc/sysdev/fsl_pci.c
index 5b264eb..d5f9ae0 100644
--- a/arch/powerpc/sysdev/fsl_pci.c
+++ b/arch/powerpc/sysdev/fsl_pci.c
@@ -187,7 +187,7 @@
 		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 @@
 		       " 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;