msm8916: fix build

fix msm8916 build broken by commit e5ff0fc8

Bug: 38423829
Test: build.
Change-Id: I86294fef097bf6a72ae895d24490aee80b69746c
diff --git a/hal/msm8916/platform.c b/hal/msm8916/platform.c
index eeca5d3..623696d 100644
--- a/hal/msm8916/platform.c
+++ b/hal/msm8916/platform.c
@@ -215,6 +215,7 @@
     [SND_DEVICE_OUT_VOICE_TX] = "voice-tx",
     [SND_DEVICE_OUT_AFE_PROXY] = "afe-proxy",
     [SND_DEVICE_OUT_USB_HEADSET] = "usb-headphones",
+    [SND_DEVICE_OUT_USB_HEADPHONES] = "usb-headphones",
     [SND_DEVICE_OUT_SPEAKER_AND_USB_HEADSET] = "speaker-and-usb-headphones",
     [SND_DEVICE_OUT_SPEAKER_PROTECTED] = "speaker-protected",
     [SND_DEVICE_OUT_VOICE_SPEAKER_PROTECTED] = "voice-speaker-protected",
@@ -302,6 +303,7 @@
     [SND_DEVICE_OUT_VOICE_TX] = 45,
     [SND_DEVICE_OUT_AFE_PROXY] = 0,
     [SND_DEVICE_OUT_USB_HEADSET] = 45,
+    [SND_DEVICE_OUT_USB_HEADPHONES] = 45,
     [SND_DEVICE_OUT_SPEAKER_AND_USB_HEADSET] = 14,
     [SND_DEVICE_OUT_SPEAKER_PROTECTED] = 124,
     [SND_DEVICE_OUT_VOICE_SPEAKER_PROTECTED] = 101,
@@ -396,6 +398,7 @@
     {TO_NAME_INDEX(SND_DEVICE_OUT_VOICE_TX)},
     {TO_NAME_INDEX(SND_DEVICE_OUT_AFE_PROXY)},
     {TO_NAME_INDEX(SND_DEVICE_OUT_USB_HEADSET)},
+    {TO_NAME_INDEX(SND_DEVICE_OUT_USB_HEADPHONES)},
     {TO_NAME_INDEX(SND_DEVICE_OUT_SPEAKER_AND_USB_HEADSET)},
     {TO_NAME_INDEX(SND_DEVICE_OUT_SPEAKER_PROTECTED)},
     {TO_NAME_INDEX(SND_DEVICE_OUT_VOICE_SPEAKER_PROTECTED)},
@@ -663,6 +666,7 @@
     backend_table[SND_DEVICE_IN_VOICE_RX] = strdup("afe-proxy");
     backend_table[SND_DEVICE_OUT_AFE_PROXY] = strdup("afe-proxy");
     backend_table[SND_DEVICE_OUT_USB_HEADSET] = strdup("usb-headphones");
+    backend_table[SND_DEVICE_OUT_USB_HEADPHONES] = strdup("usb-headphones");
     backend_table[SND_DEVICE_OUT_SPEAKER_AND_USB_HEADSET] =
         strdup("speaker-and-usb-headphones");
     backend_table[SND_DEVICE_IN_USB_HEADSET_MIC] = strdup("usb-headset-mic");