audio: add speaker safe support

Add support for safe speaker device when combined
with USB.

Bug: 35675592
Test: ringer on speaker and headset
Change-Id: I37b0172b5c1a9e2a8ce1821ebccb53b482f46578
Signed-off-by: David Lin <dtwlin@google.com>
diff --git a/hal/msm8974/platform.h b/hal/msm8974/platform.h
index 4692560..7c5133b 100644
--- a/hal/msm8974/platform.h
+++ b/hal/msm8974/platform.h
@@ -94,6 +94,7 @@
     SND_DEVICE_OUT_USB_HEADSET,
     SND_DEVICE_OUT_USB_HEADPHONES,
     SND_DEVICE_OUT_SPEAKER_AND_USB_HEADSET,
+    SND_DEVICE_OUT_SPEAKER_SAFE_AND_USB_HEADSET,
     SND_DEVICE_OUT_VOICE_USB_HEADPHONES,
     SND_DEVICE_OUT_VOICE_USB_HEADSET,
     SND_DEVICE_OUT_END,