hal: support for for mi2s speaker adsp algo.

Change-Id: I77945be6eb8f853e29e394a51eb28fc8fb759b4a
diff --git a/hal/msm8974/platform.c b/hal/msm8974/platform.c
index 00f3c2d..305e1c1 100644
--- a/hal/msm8974/platform.c
+++ b/hal/msm8974/platform.c
@@ -129,6 +129,7 @@
                                           AFE_PROXY_RECORD_PCM_DEVICE},
     [USECASE_AUDIO_RECORD_AFE_PROXY] = {AFE_PROXY_PLAYBACK_PCM_DEVICE,
                                         AFE_PROXY_RECORD_PCM_DEVICE},
+    [USECASE_AUDIO_DSM_FEEDBACK] = {QUAT_MI2S_PCM_DEVICE, QUAT_MI2S_PCM_DEVICE},
 
 };