camera: Add camera group

Create a new group for camera devices. It will only be accessed by the
camera HAL, reducing the possible vector of attack from the
browser+camera_hal to only camera_hal.

BUG=b:266181515,b:264148501,b:264130191,b:264149635,b:264148881
TEST=camera smoke test on lazor and coachz

Change-Id: I18f33d4030eaa699784bfa719b31d6587f4dafeb
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/eclass-overlay/+/4197475
Reviewed-by: Allen Webb <allenwebb@google.com>
Commit-Queue: Ricky Liang <jcliang@chromium.org>
Reviewed-by: Ricky Liang <jcliang@chromium.org>
Tested-by: Ricardo Ribalda <ribalda@chromium.org>
diff --git a/profiles/base/accounts/group/camera b/profiles/base/accounts/group/camera
new file mode 100644
index 0000000..3a1cb98
--- /dev/null
+++ b/profiles/base/accounts/group/camera
@@ -0,0 +1,3 @@
+group:camera
+gid:20042
+users:arc-camera