rgbkbd: Add rgbkbd to cros_ec-access

The cros_ec-access group is required for rgbkbd to set rgb
backlights for the Taniks device.

BUG=b:214077425
TEST=verified manually that adding /dev/cros_ec support lets rgbkbd
fetch
capabilities and set rgb keyboard backlight mode on taniks.

Cq-Depend: chromium:3709094
Change-Id: Ie1715e0beb28f1115bd5751f8e4c78ef8941dfd4
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/eclass-overlay/+/3688623
Tested-by: Zentaro Kavanagh <zentaro@chromium.org>
Tested-by: Jimmy Gong <jimmyxgong@chromium.org>
Reviewed-by: Jorge Lucangeli Obes <jorgelo@chromium.org>
Reviewed-by: YH Lin <yueherngl@chromium.org>
Commit-Queue: Zentaro Kavanagh <zentaro@chromium.org>
diff --git a/profiles/base/accounts/group/cros_ec-access b/profiles/base/accounts/group/cros_ec-access
index 53dadb0..025c182 100644
--- a/profiles/base/accounts/group/cros_ec-access
+++ b/profiles/base/accounts/group/cros_ec-access
@@ -1,6 +1,6 @@
 group:cros_ec-access
 gid:416
 # This group is to grant rw access of /dev/cros_ec to runtime_probe, healthd_ec,
-# typecd_ec and power because the binaries they run need access for probing
-# information w/o being root.
-users:runtime_probe,healthd_ec,power,typecd_ec
+# typecd_ec, power, and rgbkbd because the binaries they run need access for
+# probing information w/o being root.
+users:runtime_probe,healthd_ec,power,typecd_ec,rgbkbd