audio: hal: App type config changes for transcode loopback

Changes to enable app type config for DSP HW
transcode loopback usecase type.

CRs-Fixed: 2081126
Change-Id: I160038b5aaa404298d08e5d0b32f794531b23a82
diff --git a/hal/msm8974/platform.c b/hal/msm8974/platform.c
index f368d17..94fe996 100644
--- a/hal/msm8974/platform.c
+++ b/hal/msm8974/platform.c
@@ -2969,6 +2969,8 @@
         snd_device = voice_get_incall_rec_snd_device(usecase->in_snd_device);
     else if ((usecase->type == PCM_HFP_CALL) || (usecase->type == PCM_CAPTURE))
         snd_device = usecase->in_snd_device;
+    else if (usecase->type == TRANSCODE_LOOPBACK)
+        snd_device = usecase->out_snd_device;
 
     acdb_dev_id = acdb_device_table[platform_get_spkr_prot_snd_device(snd_device)];
     if (acdb_dev_id < 0) {