overlays: dts: use prebuilt library for production

DTS codec targets the integration on sof-mtl-rt5650-dts.tplg. The
firmware build config should not set COMP_STUBS. At the same time the
config GOOGLE_RTC_PROCESSING_MOCK should be enabled as since its
libraries are still WIP.

Signed-off-by: Pin-chih Lin <johnylin@google.com>

app/overlays/mtl/dts_overlay.conf

@@ -1,3 +1,8 @@
+# Use DTS pre-built library for production
+CONFIG_COMP_STUBS=n
+# Google RTC library is WIP
+CONFIG_GOOGLE_RTC_AUDIO_PROCESSING_MOCK=y
+
 CONFIG_COMP_IIR=y
 CONFIG_COMP_MODULE_ADAPTER=y
 CONFIG_DTS_CODEC=y