Make the remote submix audio module available.

Bug: 10265163
Change-Id: I20715a8a8f41596c69b4f2ece29c8ad8710a13be
diff --git a/device-common.mk b/device-common.mk
index 0ce2d20..c76e48c 100644
--- a/device-common.mk
+++ b/device-common.mk
@@ -72,6 +72,7 @@
     power.grouper \
     audio.a2dp.default \
     audio.usb.default \
+    audio.r_submix.default \
     librs_jni \
     setup_fs \
     l2ping \