Add smdisplay user to video group

We have added the smdisplay user and group.
SMIUSBDisplay daemon needs access to DRM (video group).
We need this permission to run SMIUSBDisplay daemon as smdisplay user.

BUG=b:161406145
TEST=smdisplay user is added to the video group in built image.
Cq-Depend: chromium:2336637
Change-Id: I49e6df146b2015c02f266ca05171beb8bda8bcf4
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/eclass-overlay/+/2292972
Tested-by: Teddy Wang <teddy.wang@siliconmotions.corp-partner.google.com>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Stéphane Marchesin <marcheu@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>

profiles/base/accounts/group/video

diff --git a/profiles/base/accounts/group/video b/profiles/base/accounts/group/video
index 00836a2..2695cc4 100644
--- a/profiles/base/accounts/group/video
+++ b/profiles/base/accounts/group/video
@@ -1,3 +1,3 @@
 group:video
 gid:27
-users:root,chronos,arc-camera,dlm,rtanalytics,crosvm,cfm-monitor
+users:root,chronos,arc-camera,dlm,rtanalytics,crosvm,cfm-monitor,smdisplay