Show the ADB icon in the status bar again.

Bug: 6440323
Change-Id: I3b1972d18be4ad77a87c4b71673b6cfb7735c59e

Author: dsandler

services/java/com/android/server/usb/UsbDeviceManager.java

@@ -686,7 +686,7 @@ private void updateAdbNotification() {
                     notification.defaults = 0; // please be quiet
                     notification.sound = null;
                     notification.vibrate = null;
-                    notification.priority = Notification.PRIORITY_MIN;
+                    notification.priority = Notification.PRIORITY_LOW;
 
                     Intent intent = Intent.makeRestartActivityTask(
                             new ComponentName("com.android.settings",