Add Key mapping to CEC_KEYCODE_SOUND_SELECT

Map Android KeyCode KEYCODE_MEDIA_AUDIO_TRACK, to CEC_KEYCODE_SOUND_SELECT.

[Buganizer]
b/136423086

Change-Id: I3d83da95bcfe2b606fed9088d1d0e0c7c5082ce1
diff --git a/services/core/java/com/android/server/hdmi/HdmiCecKeycode.java b/services/core/java/com/android/server/hdmi/HdmiCecKeycode.java
index adc1cd7..8148216 100644
--- a/services/core/java/com/android/server/hdmi/HdmiCecKeycode.java
+++ b/services/core/java/com/android/server/hdmi/HdmiCecKeycode.java
@@ -290,8 +290,7 @@
             new KeycodeEntry(KeyEvent.KEYCODE_CHANNEL_UP, CEC_KEYCODE_CHANNEL_UP),
             new KeycodeEntry(KeyEvent.KEYCODE_CHANNEL_DOWN, CEC_KEYCODE_CHANNEL_DOWN),
             new KeycodeEntry(KeyEvent.KEYCODE_LAST_CHANNEL, CEC_KEYCODE_PREVIOUS_CHANNEL),
-            // No Android keycode defined for CEC_KEYCODE_SOUND_SELECT
-            new KeycodeEntry(UNSUPPORTED_KEYCODE, CEC_KEYCODE_SOUND_SELECT),
+            new KeycodeEntry(KeyEvent.KEYCODE_MEDIA_AUDIO_TRACK, CEC_KEYCODE_SOUND_SELECT),
             new KeycodeEntry(KeyEvent.KEYCODE_TV_INPUT, CEC_KEYCODE_INPUT_SELECT),
             new KeycodeEntry(KeyEvent.KEYCODE_INFO, CEC_KEYCODE_DISPLAY_INFORMATION),
             // No Android keycode defined for CEC_KEYCODE_HELP