struct effect_descriptor_s const correctness

Also struct audio_stream in audio_stream_frame_size

Change-Id: Ie0de708e38a1850c186a8b4eb5f491adc44b3275
diff --git a/include/hardware/audio_policy.h b/include/hardware/audio_policy.h
index 8924dd1..53c8ae3 100644
--- a/include/hardware/audio_policy.h
+++ b/include/hardware/audio_policy.h
@@ -215,10 +215,10 @@
 
     /* Audio effect management */
     audio_io_handle_t (*get_output_for_effect)(struct audio_policy *pol,
-                                            struct effect_descriptor_s *desc);
+                                            const struct effect_descriptor_s *desc);
 
     int (*register_effect)(struct audio_policy *pol,
-                           struct effect_descriptor_s *desc,
+                           const struct effect_descriptor_s *desc,
                            audio_io_handle_t output,
                            uint32_t strategy,
                            int session,