mdt-services: Include the new repo

Change-Id: I5c8de4375ee5e01aacba2985dc35b84c8be91f6d
diff --git a/mendel.xml b/mendel.xml
index 462f7d6..c25c4a6 100644
--- a/mendel.xml
+++ b/mendel.xml
@@ -28,6 +28,7 @@
     <project path="packages/aiy-board-tweaks" name="aiy-board-tweaks" />
     <project path="packages/aiy-board-wlan" name="aiy-board-wlan" />
     <project path="packages/base-files" name="base-files" />
+    <project path="packages/mdt-services" name="mdt-services" />
     <project path="packages/mendel-distro-info-data" name="mendel-distro-info-data" />
     <project path="packages/runonce" name="runonce" />