Align before signing in apk_masseur.py

Change-Id: Ibd3816a8067ccd8cc8729a55f1ec83a5c50dd86c
diff --git a/tools/apk_utils.py b/tools/apk_utils.py
index 86d3b0f..906284e 100755
--- a/tools/apk_utils.py
+++ b/tools/apk_utils.py
@@ -90,6 +90,7 @@
     '--ks-pass', 'pass:' + password,
     '--min-sdk-version', '19',
     '--out', signed_apk,
+    '--v2-signing-enabled',
     unsigned_apk
   ]
   utils.RunCmd(cmd, quiet=quiet, logging=logging)