audiopolicy: add dump for audio patches

Bug: 10549017.
Change-Id: I896c8e16c8cf7490bab75295903620a76236f571
diff --git a/services/audiopolicy/AudioPolicyManager.h b/services/audiopolicy/AudioPolicyManager.h
index 95aab65..ca01024 100644
--- a/services/audiopolicy/AudioPolicyManager.h
+++ b/services/audiopolicy/AudioPolicyManager.h
@@ -309,6 +309,8 @@
                        const struct audio_patch *patch, uid_t uid) :
                            mHandle(handle), mPatch(*patch), mUid(uid), mAfPatchHandle(0) {}
 
+            status_t dump(int fd, int spaces, int index) const;
+
             audio_patch_handle_t mHandle;
             struct audio_patch mPatch;
             uid_t mUid;