Fix perf keyval in audio playback power test

BUG=None
TEST=None

Change-Id: I5a1e6c363ce7641af00b341cc3e373857805f6d1
Reviewed-on: https://chromium-review.googlesource.com/275477
Reviewed-by: Rohit Makasana <rohitbm@chromium.org>
Commit-Queue: Rohit Makasana <rohitbm@chromium.org>
Tested-by: Rohit Makasana <rohitbm@chromium.org>
diff --git a/client/site_tests/audio_PlaybackPower/audio_PlaybackPower.py b/client/site_tests/audio_PlaybackPower/audio_PlaybackPower.py
index ddde064..8bfaf31 100644
--- a/client/site_tests/audio_PlaybackPower/audio_PlaybackPower.py
+++ b/client/site_tests/audio_PlaybackPower/audio_PlaybackPower.py
@@ -70,7 +70,7 @@
         energy_rate = get_power()
         perf_keyval = {}
         perf_keyval[POWER_DESCRIPTION + audio_type] = energy_rate
-        self.output_perf_value(description=POWER_DESCRIPTION,
+        self.output_perf_value(description=POWER_DESCRIPTION + audio_type,
                                value=energy_rate, units='W',
                                higher_is_better=False)
         self.write_perf_keyval(perf_keyval)