eclass-overlay: Add pluginvm to wayland group

The plugin VM UI needs access to the wayland socket, so add it to the
wayland group.

CQ-DEPEND=CL:1564711
BUG=b:117989168
TEST=Build and boot

Change-Id: I3119e663022b61cc51fd6e9f0e018766a971725f
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/eclass-overlay/+/1564616
Reviewed-by: Chirantan Ekbote <chirantan@chromium.org>
Tested-by: Dmitry Torokhov <dtor@chromium.org>
diff --git a/profiles/base/accounts/group/wayland b/profiles/base/accounts/group/wayland
index f580c2a..53a6814 100644
--- a/profiles/base/accounts/group/wayland
+++ b/profiles/base/accounts/group/wayland
@@ -1,4 +1,4 @@
 # Controls access to the wayland server in Chrome
 group:wayland
 gid:601
-users:chronos,crosvm
+users:chronos,crosvm,pluginvm