Add crosvm to arc-camera group

This is needed for VMs to access the unix domain socket
/var/run/camera/camera3.sock to talk to the camera HAL.

CQ-DEPEND=CL:1531499
BUG=b:128911806
TEST=run /profiles/base/accounts/display-accts.py

Change-Id: Ide7bbba9975e0e5f7efdcdb9f016086f72c94762
Reviewed-on: https://chromium-review.googlesource.com/1532452
Commit-Ready: Dmitry Torokhov <dtor@chromium.org>
Tested-by: Dmitry Torokhov <dtor@chromium.org>
Reviewed-by: Chirantan Ekbote <chirantan@chromium.org>
diff --git a/profiles/base/accounts/group/arc-camera b/profiles/base/accounts/group/arc-camera
index e140fbf..c48d85e 100644
--- a/profiles/base/accounts/group/arc-camera
+++ b/profiles/base/accounts/group/arc-camera
@@ -1,3 +1,3 @@
 group:arc-camera
 gid:603
-users:chronos
+users:chronos,crosvm