pci: Remove unused ppc4xx variable from struct pci_controller

ppc4xx support was removed some time ago. Lets remove the now unused
"pci_fb" variable from "struct pci_controller" as well.

Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Bin Meng <bmeng.cn@gmail.com>
Cc: Simon Glass <sjg@chromium.org>

include/pci.h

@@ -585,8 +585,6 @@ struct pci_controller {
 	/* Used by auto config */
 	struct pci_region *pci_mem, *pci_io, *pci_prefetch;
 
-	/* Used by ppc405 autoconfig*/
-	struct pci_region *pci_fb;
 #ifndef CONFIG_DM_PCI
 	int current_busno;