usb: dwc3: Use UCLASS_NOP instead of UCLASS_MISC for the DWC3 generic glue

dwc3-generic has been broken since MISC uclass has been modified to scan DT
sub-nodes after bind.
Fixing it by a using the no-op uclass.

Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/usb/dwc3/dwc3-generic.c b/drivers/usb/dwc3/dwc3-generic.c
index 70431fa..406bf0b 100644
--- a/drivers/usb/dwc3/dwc3-generic.c
+++ b/drivers/usb/dwc3/dwc3-generic.c
@@ -350,7 +350,7 @@
 
 U_BOOT_DRIVER(dwc3_generic_wrapper) = {
 	.name	= "dwc3-generic-wrapper",
-	.id	= UCLASS_MISC,
+	.id	= UCLASS_NOP,
 	.of_match = dwc3_glue_ids,
 	.bind = dwc3_glue_bind,
 	.probe = dwc3_glue_probe,