hal: Add support for ssr audio feature

Update audio HAL to support surround sound recording (5.1 channels)

Change-Id: I5b24340251b55ad5c602f2de0a0b4c7672ba729b
diff --git a/hal/msm8974/platform.h b/hal/msm8974/platform.h
index d34aa41..bc1e784 100644
--- a/hal/msm8974/platform.h
+++ b/hal/msm8974/platform.h
@@ -104,6 +104,7 @@
     SND_DEVICE_IN_USB_HEADSET_MIC,
     SND_DEVICE_IN_CAPTURE_FM,
     SND_DEVICE_IN_AANC_HANDSET_MIC,
+    SND_DEVICE_IN_QUAD_MIC,
     SND_DEVICE_IN_END,
 
     SND_DEVICE_MAX = SND_DEVICE_IN_END,