aaudio: set ramp frames based on sample rate

Now it will be the same number of msec at any rate.

Bug: 68804159
Test: write_sine_callback -pl -s60
Test: then change volume. Should be smooth.
Change-Id: I1f375e5a680198d0f8c6c398b22faf8b092e94fd
diff --git a/media/libaaudio/src/client/AudioStreamInternalPlay.h b/media/libaaudio/src/client/AudioStreamInternalPlay.h
index 04e4a62..977a909 100644
--- a/media/libaaudio/src/client/AudioStreamInternalPlay.h
+++ b/media/libaaudio/src/client/AudioStreamInternalPlay.h
@@ -33,6 +33,8 @@
     AudioStreamInternalPlay(AAudioServiceInterface  &serviceInterface, bool inService = false);
     virtual ~AudioStreamInternalPlay();
 
+    aaudio_result_t open(const AudioStreamBuilder &builder) override;
+
     aaudio_result_t requestPause() override;
 
     aaudio_result_t requestFlush() override;