system_app: remove unnecessary changes to neverallow

Follow-up for aosp/1520729. These are no longer needed.

Test: build
BUG: 175121264
Change-Id: I7f01d4d4cee18751f4321ef8efa68f9faae06d4f
diff --git a/public/app.te b/public/app.te
index 5e12fbb..40c7e71 100644
--- a/public/app.te
+++ b/public/app.te
@@ -473,10 +473,10 @@
 # Write to various other parts of /data.
 neverallow appdomain drm_data_file:dir_file_class_set
     { create write setattr relabelfrom relabelto append unlink link rename };
-neverallow { appdomain -platform_app -system_app }
+neverallow { appdomain -platform_app }
     apk_data_file:dir_file_class_set
     { create write setattr relabelfrom relabelto append unlink link rename };
-neverallow { appdomain -platform_app -system_app }
+neverallow { appdomain -platform_app }
     apk_tmp_file:dir_file_class_set
     { create write setattr relabelfrom relabelto append unlink link rename };
 neverallow { appdomain -platform_app }