configs: trinket: Add backend tag for voice-handset-tmus device

Backend tag is missing for voice-handset-tmus sound device
which leads to improper mixer path selection.
Add the respective backend tag to fix this issue.

Change-Id: I23d3e2e624be50349a129a8bfc730231985079c6
diff --git a/configs/trinket/audio_platform_info_intcodec.xml b/configs/trinket/audio_platform_info_intcodec.xml
index 0d307c6..f299122 100644
--- a/configs/trinket/audio_platform_info_intcodec.xml
+++ b/configs/trinket/audio_platform_info_intcodec.xml
@@ -129,6 +129,7 @@
         <device name="SND_DEVICE_OUT_SPEAKER_AND_HEADPHONES_EXTERNAL_1" interface="WSA_CDC_DMA_RX_0-and-RX_CDC_DMA_RX_0"/>
         <device name="SND_DEVICE_OUT_SPEAKER_AND_HEADPHONES_EXTERNAL_2" interface="WSA_CDC_DMA_RX_0-and-RX_CDC_DMA_RX_0"/>
         <device name="SND_DEVICE_OUT_VOICE_HANDSET" backend="handset" interface="RX_CDC_DMA_RX_0"/>
+        <device name="SND_DEVICE_OUT_VOICE_HANDSET_TMUS" backend="handset" interface="RX_CDC_DMA_RX_0"/>
         <device name="SND_DEVICE_IN_HANDSET_GENERIC_QMIC" interface="TX_CDC_DMA_TX_3"/>
         <device name="SND_DEVICE_OUT_VOICE_SPEAKER" interface="WSA_CDC_DMA_RX_0"/>
         <device name="SND_DEVICE_OUT_VOICE_SPEAKER_VBAT" interface="WSA_CDC_DMA_RX_0"/>
diff --git a/configs/trinket/audio_platform_info_qrd.xml b/configs/trinket/audio_platform_info_qrd.xml
index d7571f2..e9ed6d6 100644
--- a/configs/trinket/audio_platform_info_qrd.xml
+++ b/configs/trinket/audio_platform_info_qrd.xml
@@ -125,6 +125,7 @@
         <device name="SND_DEVICE_OUT_SPEAKER_AND_HEADPHONES_EXTERNAL_1" interface="WSA_CDC_DMA_RX_0-and-RX_CDC_DMA_RX_0"/>
         <device name="SND_DEVICE_OUT_SPEAKER_AND_HEADPHONES_EXTERNAL_2" interface="WSA_CDC_DMA_RX_0-and-RX_CDC_DMA_RX_0"/>
         <device name="SND_DEVICE_OUT_VOICE_HANDSET" backend="handset" interface="RX_CDC_DMA_RX_0"/>
+        <device name="SND_DEVICE_OUT_VOICE_HANDSET_TMUS" backend="handset" interface="RX_CDC_DMA_RX_0"/>
         <device name="SND_DEVICE_IN_HANDSET_GENERIC_QMIC" interface="TX_CDC_DMA_TX_3"/>
         <device name="SND_DEVICE_OUT_VOICE_SPEAKER" interface="WSA_CDC_DMA_RX_0"/>
         <device name="SND_DEVICE_OUT_VOICE_SPEAKER_VBAT" interface="WSA_CDC_DMA_RX_0"/>