aaudio: MMAP input not implement pause flush

They should return AAUDIO_ERROR_UNIMPLEMENTED
just like the legacy streams.

Bug: 63351465
Test: CTS test_aaudio.cpp testPauseAndFlushNotSupported
Change-Id: I42c8d45517bf0d808e648287579b9fb0c0cb3ae0
diff --git a/media/libaaudio/src/client/AudioStreamInternalPlay.h b/media/libaaudio/src/client/AudioStreamInternalPlay.h
index b043f67..e59d02c 100644
--- a/media/libaaudio/src/client/AudioStreamInternalPlay.h
+++ b/media/libaaudio/src/client/AudioStreamInternalPlay.h
@@ -33,6 +33,10 @@
     AudioStreamInternalPlay(AAudioServiceInterface  &serviceInterface, bool inService = false);
     virtual ~AudioStreamInternalPlay();
 
+    aaudio_result_t requestPause() override;
+
+    aaudio_result_t requestFlush() override;
+
     aaudio_result_t write(const void *buffer,
                           int32_t numFrames,
                           int64_t timeoutNanoseconds) override;
@@ -47,6 +51,11 @@
     }
 
 protected:
+
+    aaudio_result_t requestPauseInternal();
+
+    void onFlushFromServer() override;
+
 /**
  * Low level write that will not block. It will just write as much as it can.
  *