sepolicy: Put theme service in its own context

Allow the theme manager and its data to be sandboxed in
its own context

Change-Id: I7898663d1c196bfe04fa4c539d20191a43fde284
diff --git a/sepolicy/drmserver.te b/sepolicy/drmserver.te
index 63f654f..508791f 100644
--- a/sepolicy/drmserver.te
+++ b/sepolicy/drmserver.te
@@ -1 +1 @@
-allow drmserver theme_data_file:file r_file_perms;
+allow drmserver themeservice_app_data_file:file r_file_perms;