pci: Fix setting controller's last_busno

Initially it is set to dev_seq but update to the last bus number is
missing. Fix it.

Signed-off-by: Pali Rohár <pali@kernel.org>
Reviewed-by: Stefan Roese <sr@denx.de>
diff --git a/drivers/pci/pci-uclass.c b/drivers/pci/pci-uclass.c
index c66cd75..33dda00 100644
--- a/drivers/pci/pci-uclass.c
+++ b/drivers/pci/pci-uclass.c
@@ -560,6 +560,8 @@
 		if (pplat->class == (PCI_CLASS_DISPLAY_VGA << 8))
 			set_vga_bridge_bits(dev);
 	}
+	if (hose->last_busno < sub_bus)
+		hose->last_busno = sub_bus;
 	debug("%s: done\n", __func__);
 
 	return log_msg_ret("sub", sub_bus);