PCI: make pci_flags non-weak

No architecture defines its own pci_flags, so the core symbol does not
need to be weak.

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

drivers/pci/setup-bus.c

@@ -28,7 +28,7 @@
 #include <asm-generic/pci-bridge.h>
 #include "pci.h"
 
-unsigned int __weak pci_flags;
+unsigned int pci_flags;
 
 struct pci_dev_resource {
 	struct list_head list;