usb: lowlevel interface change to support multiple controllers

Carry an index in the lowlevel usb functions to make specify the
respective usb controller.

Also pass through an controller struct from lowlevel_init to the
creation of the root usb device of this controller.

Signed-off-by: Lucas Stach <dev@lynxeye.de>
Reviewed-by: Marek Vasut <marex@denx.de>
diff --git a/drivers/usb/host/sl811-hcd.c b/drivers/usb/host/sl811-hcd.c
index bb27dd5..2830616 100644
--- a/drivers/usb/host/sl811-hcd.c
+++ b/drivers/usb/host/sl811-hcd.c
@@ -210,14 +210,14 @@
 	return 1;
 }
 
-int usb_lowlevel_init(void)
+int usb_lowlevel_init(int index, void **controller)
 {
 	root_hub_devnum = 0;
 	sl811_hc_reset();
 	return 0;
 }
 
-int usb_lowlevel_stop(void)
+int usb_lowlevel_stop(int index)
 {
 	sl811_hc_reset();
 	return 0;