hal: enable audio over display port

Add support for audio over display port.

Change-Id: I3480d89c61ee5e5983715ec943fb02b1a9d5d151
diff --git a/hal/msm8960/platform.h b/hal/msm8960/platform.h
index 07060b6..c9ac74a 100644
--- a/hal/msm8960/platform.h
+++ b/hal/msm8960/platform.h
@@ -63,6 +63,8 @@
     SND_DEVICE_OUT_VOICE_HEADPHONES,
     SND_DEVICE_OUT_HDMI,
     SND_DEVICE_OUT_SPEAKER_AND_HDMI,
+    SND_DEVICE_OUT_DISPLAY_PORT,
+    SND_DEVICE_OUT_SPEAKER_AND_DISPLAY_PORT,
     SND_DEVICE_OUT_BT_SCO,
     SND_DEVICE_OUT_BT_A2DP,
     SND_DEVICE_OUT_SPEAKER_AND_BT_A2DP,