releasetools: flash super_empty on full ota

* Fixes install over stock ROM
* Also fix path for flashing dtbo

Change-Id: I5493937b5154894f0fa7182f080dd92d069b5725
diff --git a/releasetools/releasetools.py b/releasetools/releasetools.py
index 46f9415..f2a3b69 100644
--- a/releasetools/releasetools.py
+++ b/releasetools/releasetools.py
@@ -31,7 +31,14 @@
   common.ZipWriteStr(info.output_zip, name, data)
   info.script.AppendExtra('package_extract_file("%s", "%s");' % (name, dest))
 
+def PrintInfo(info, dest):
+  info.script.Print("Patching {} image unconditionally...".format(dest.split('/')[-1]))
+
 def OTA_InstallEnd(info):
-  info.script.Print("Flashing dtbo image...")
-  AddImage(info, "dtbo.img", "/dev/block/bootdevice/by-name/dtbo")
+  PrintInfo(info, "/dev/block/by-name/dtbo")
+  AddImage(info, "dtbo.img", "/dev/block/by-name/dtbo")
+  return
+
+def FullOTA_InstallBegin(info):
+  AddImage(info, "super_empty.img", "/dev/block/by-name/super")
   return