odml: Add odml user and groups

Add the odml user and group for running the jailed odml system daemon,
and the odml group to designate users which can call dbus methods
provided by odml.

BUG=b:350812378
TEST=./display-accts.py --lint

Change-Id: Ibae4731ee4276269218cc36ddc07e7bcf47259b0
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/eclass-overlay/+/5678561
Tested-by: Yi Chou <yich@google.com>
Commit-Queue: Yi Chou <yich@google.com>
Reviewed-by: Jorge Lucangeli Obes <jorgelo@chromium.org>
diff --git a/profiles/base/accounts/group/odml b/profiles/base/accounts/group/odml
new file mode 100644
index 0000000..0291122
--- /dev/null
+++ b/profiles/base/accounts/group/odml
@@ -0,0 +1,4 @@
+group:odml
+password:!
+gid:20218
+users:odml
diff --git a/profiles/base/accounts/user/odml b/profiles/base/accounts/user/odml
new file mode 100644
index 0000000..0ddebfc
--- /dev/null
+++ b/profiles/base/accounts/user/odml
@@ -0,0 +1,6 @@
+user:odml
+uid:20218
+gid:20218
+gecos:On-device ML daemon
+home:/dev/null
+shell:/bin/false