Add rtanalytics user to audio group

BUG=chromium:811341
TEST=local build
CQ-DEPEND=CL:914449

Change-Id: Ic19ff2842ccc0a43ae93b39ff30981f081c147de
Reviewed-on: https://chromium-review.googlesource.com/914128
Commit-Ready: Wei Guan <weigua@chromium.org>
Tested-by: Wei Guan <weigua@chromium.org>
Reviewed-by: Jorge Lucangeli Obes <jorgelo@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
(cherry picked from commit 5d9ab329e0178545e3d3ac6fe8b3eb51eb5ba12f)
Reviewed-on: https://chromium-review.googlesource.com/926681
Reviewed-by: Simon Que <sque@chromium.org>
Tested-by: Simon Que <sque@chromium.org>
diff --git a/profiles/base/accounts/group/audio b/profiles/base/accounts/group/audio
index abef6f7..739276b 100644
--- a/profiles/base/accounts/group/audio
+++ b/profiles/base/accounts/group/audio
@@ -1,3 +1,3 @@
 group:audio
 gid:18
-users:cras,chronos,volume,midis
+users:cras,chronos,volume,midis,rtanalytics