CSD: enable CSD for MMap threads

Using the buffer provided by the AAudio service to add values to the
sound dosage.

Test: OboeTester with AAudio and MMap
Bug: 264254430
Change-Id: I38b7d3b69bc8d6923f848bc504c6290ae1961cbc
diff --git a/services/audioflinger/AudioFlinger.h b/services/audioflinger/AudioFlinger.h
index 876acbc..2204f8f 100644
--- a/services/audioflinger/AudioFlinger.h
+++ b/services/audioflinger/AudioFlinger.h
@@ -764,6 +764,8 @@
     };
 
               ThreadBase *checkThread_l(audio_io_handle_t ioHandle) const;
+              sp<AudioFlinger::ThreadBase> checkOutputThread_l(audio_io_handle_t ioHandle) const
+                      REQUIRES(mLock);
               PlaybackThread *checkPlaybackThread_l(audio_io_handle_t output) const;
               MixerThread *checkMixerThread_l(audio_io_handle_t output) const;
               RecordThread *checkRecordThread_l(audio_io_handle_t input) const;