hal: Add support for voice speaker stereo

Add device entries and additional support to enable
voice speaker stereo and stereo-protected features.

Change-Id: Iad40d6a297824181ed380a5a3f37254f58144de5
diff --git a/hal/msm8974/platform.h b/hal/msm8974/platform.h
index f4c8ab6..ccbc413 100644
--- a/hal/msm8974/platform.h
+++ b/hal/msm8974/platform.h
@@ -96,6 +96,7 @@
     SND_DEVICE_OUT_SPEAKER_AND_HEADPHONES_EXTERNAL_2,
     SND_DEVICE_OUT_VOICE_HANDSET,
     SND_DEVICE_OUT_VOICE_SPEAKER,
+    SND_DEVICE_OUT_VOICE_SPEAKER_STEREO,
     SND_DEVICE_OUT_VOICE_SPEAKER_VBAT,
     SND_DEVICE_OUT_VOICE_SPEAKER_2,
     SND_DEVICE_OUT_VOICE_SPEAKER_2_VBAT,
@@ -134,6 +135,7 @@
     SND_DEVICE_OUT_SPEAKER_PROTECTED,
     SND_DEVICE_OUT_VOICE_SPEAKER_PROTECTED,
     SND_DEVICE_OUT_VOICE_SPEAKER_2_PROTECTED,
+    SND_DEVICE_OUT_VOICE_SPEAKER_STEREO_PROTECTED,
     SND_DEVICE_OUT_SPEAKER_PROTECTED_VBAT,
     SND_DEVICE_OUT_VOICE_SPEAKER_PROTECTED_VBAT,
     SND_DEVICE_OUT_VOICE_SPEAKER_2_PROTECTED_VBAT,
@@ -145,6 +147,9 @@
     SND_DEVICE_OUT_VOICE_SPEAKER_AND_VOICE_HEADPHONES,
     SND_DEVICE_OUT_VOICE_SPEAKER_AND_VOICE_ANC_HEADSET,
     SND_DEVICE_OUT_VOICE_SPEAKER_AND_VOICE_ANC_FB_HEADSET,
+    SND_DEVICE_OUT_VOICE_SPEAKER_STEREO_AND_VOICE_HEADPHONES,
+    SND_DEVICE_OUT_VOICE_SPEAKER_STEREO_AND_VOICE_ANC_HEADSET,
+    SND_DEVICE_OUT_VOICE_SPEAKER_STEREO_AND_VOICE_ANC_FB_HEADSET,
     SND_DEVICE_OUT_END,
 
     /*