Put privileged apps under system/priv-app/ directory

In the past we have put them under the default system/app.

BUG:18338400
Change-Id: I2b6912b6a9955ebd9348ea658e20a3d7cbba8b34
diff --git a/generate-packages.sh b/generate-packages.sh
index f86693b..9591833 100755
--- a/generate-packages.sh
+++ b/generate-packages.sh
@@ -82,6 +82,11 @@
       echo "LOCAL_SRC_FILES := \$(LOCAL_MODULE).apk" >> ${APK_MAKEFILE}
       echo "LOCAL_CERTIFICATE := PRESIGNED" >> ${APK_MAKEFILE}
 
+      if [[ ${ONE_FILE} == *priv-app/* ]]
+      then
+        echo "LOCAL_PRIVILEGED_MODULE := true" >> ${APK_MAKEFILE}
+      fi
+
       if [[ ${TMP_ONE_FILE_NAME} == "LeanbackLauncher" ]]
       then
         echo "LOCAL_OVERRIDES_PACKAGES := Launcher2" >> ${APK_MAKEFILE}