adbd: allow ddms screen capture to work again

am: 5e8402df

* commit '5e8402df':
  adbd: allow ddms screen capture to work again

adbd.te

@@ -62,6 +62,8 @@ binder_use(adbd)
 binder_call(adbd, surfaceflinger)
 # b/13188914
 allow adbd gpu_device:chr_file rw_file_perms;
+allow adbd ion_device:chr_file r_file_perms;
+r_dir_file(adbd, system_file)
 
 # Read /data/misc/adb/adb_keys.
 allow adbd adb_keys_file:dir search;