usb: host: dwc3-sti-glue: Use UCLASS_NOP instead of UCLASS_MISC

dwc3-sti-glue 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: Patrice Chotard <patrice.chotard@st.com>
diff --git a/drivers/usb/host/dwc3-sti-glue.c b/drivers/usb/host/dwc3-sti-glue.c
index c99a198..99d4e29 100644
--- a/drivers/usb/host/dwc3-sti-glue.c
+++ b/drivers/usb/host/dwc3-sti-glue.c
@@ -239,7 +239,7 @@
 
 U_BOOT_DRIVER(dwc3_sti_glue) = {
 	.name = "dwc3_sti_glue",
-	.id = UCLASS_MISC,
+	.id = UCLASS_NOP,
 	.of_match = sti_dwc3_glue_ids,
 	.ofdata_to_platdata = sti_dwc3_glue_ofdata_to_platdata,
 	.probe = sti_dwc3_glue_probe,