Add command for enable USB adb

target/allwinner/mandolin-common/base-files/etc/rc.local

@@ -0,0 +1,7 @@
+# Put your custom commands here that should be executed once
+# the system init finished. By default this file does nothing.
+
+# patch for enable usb adb
+cat /sys/devices/platform/soc/usbc0/usb_device
+
+exit 0