r_submix: add owners file

Bug: 141604269
Test: see gerrit
Change-Id: I975390f8f495267ef0cd24dc8e73db859e541146
diff --git a/modules/audio_remote_submix/OWNERS b/modules/audio_remote_submix/OWNERS
new file mode 100644
index 0000000..67da0f9
--- /dev/null
+++ b/modules/audio_remote_submix/OWNERS
@@ -0,0 +1,3 @@
+elaurent@google.com
+mnaganov@google.com
+jmtrivi@google.com