hal: Add the missing sound device of voice_speaker

8x10 skuab uses lineout path instead of speaker. Add the missing
voice_speaker device in the array so that hal can select the
correct path for voice speaker in 8x10 skuab.

CRs-fixed: 621807
Change-Id: I5509184e368121cb1825392fce3860af20a9fa44
diff --git a/hal/msm8974/hw_info.c b/hal/msm8974/hw_info.c
index 128e4af..f32ee44 100644
--- a/hal/msm8974/hw_info.c
+++ b/hal/msm8974/hw_info.c
@@ -121,6 +121,7 @@
     SND_DEVICE_OUT_SPEAKER,
     SND_DEVICE_OUT_SPEAKER_AND_HEADPHONES,
     SND_DEVICE_OUT_SPEAKER_AND_ANC_HEADSET,
+    SND_DEVICE_OUT_VOICE_SPEAKER,
 };
 
 static void  update_hardware_info_8084(struct hardware_info *hw_info, const char *snd_card_name)