USB: Separate out USB hub driver

Signed-off-by: Marek Vasut <marek.vasut@gmail.com>
Cc: Remy Bohmer <linux@bohmer.net>
Acked-by: Mike Frysinger <vapier@gentoo.org>
diff --git a/common/Makefile b/common/Makefile
index 2d9ae8c..2a31c62 100644
--- a/common/Makefile
+++ b/common/Makefile
@@ -157,7 +157,7 @@
 COBJS-$(CONFIG_CMD_UNZIP) += cmd_unzip.o
 ifdef CONFIG_CMD_USB
 COBJS-y += cmd_usb.o
-COBJS-y += usb.o
+COBJS-y += usb.o usb_hub.o
 COBJS-$(CONFIG_USB_STORAGE) += usb_storage.o
 endif
 COBJS-$(CONFIG_CMD_XIMG) += cmd_ximg.o