mpc8640: Update the io_sel fields for PCI Express

Previously io_sel=0xe incorrect stated PCIE1 was enabled.  Also add
support for the mpc8640's PCIE2 interface.

Signed-off-by: Peter Tyser <ptyser@xes-inc.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

arch/powerpc/cpu/mpc8xxx/pci_cfg.c

@@ -138,7 +138,10 @@ static struct pci_info pci_config_info[] =
 {
 	[LAW_TRGT_IF_PCIE_1] = {
 		.cfg =   (1 << 2) | (1 << 3) | (1 << 5) | (1 << 6) |
-			 (1 << 7) | (1 << 0xe) | (1 << 0xf),
+			 (1 << 7) | (1 << 0xf),
+	},
+	[LAW_TRGT_IF_PCIE_2] = {
+		.cfg =   (1 << 3) | (1 << 0xe) | (1 << 0xf),
 	},
 };
 #elif defined(CONFIG_P1011) || defined(CONFIG_P1020) || \