warp7: Switch to DM USB

This commit switches to DM USB for warp7 and warp7_bl33 defconfigs.

Signed-off-by: Pierre-Jean Texier <pjtexier@koncepto.io>
Signed-off-by: Joris Offouga <offougajoris@gmail.com>
Reviewed-by: Fabio Estevam <festevam@gmail.com>
diff --git a/arch/arm/dts/imx7s-warp.dts b/arch/arm/dts/imx7s-warp.dts
index 4d87348..db5ef67 100644
--- a/arch/arm/dts/imx7s-warp.dts
+++ b/arch/arm/dts/imx7s-warp.dts
@@ -19,6 +19,7 @@
 
 	aliases {
 		mmc0 = &usdhc3;
+		usb0 = &usbotg1;
 	};
 
 	chosen {