diagnostics: Add new group for access event device

Healthd plans to monitor the event inside executor delegate (run as
`healthd_evdev` under minijail with proper seccomp policy), so we don't
need to add the entire `cros_healthd` into the `input` group.

BUG=b:259869676
TEST=./display-accts.py --lint

Change-Id: Iee1d65e55df25738a69ea3039435b7b7c3565d6a
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/eclass-overlay/+/4042261
Reviewed-by: Jorge Lucangeli Obes <jorgelo@chromium.org>
Commit-Queue: Kerker Yang <kerker@chromium.org>
Tested-by: Kerker Yang <kerker@chromium.org>
diff --git a/profiles/base/accounts/group/healthd_evdev b/profiles/base/accounts/group/healthd_evdev
new file mode 100644
index 0000000..f0b0315
--- /dev/null
+++ b/profiles/base/accounts/group/healthd_evdev
@@ -0,0 +1,3 @@
+group:healthd_evdev
+gid:20198
+users:healthd_evdev
diff --git a/profiles/base/accounts/user/healthd_evdev b/profiles/base/accounts/user/healthd_evdev
new file mode 100644
index 0000000..80de67d
--- /dev/null
+++ b/profiles/base/accounts/user/healthd_evdev
@@ -0,0 +1,6 @@
+user:healthd_evdev
+uid:20198
+gid:20198
+gecos:Healthd user for accessing event device (evdev).
+home:/dev/null
+shell:/bin/false