M60: Disable Arc++ For Chell (no target for M60)

BUG=None
TEST=None

Change-Id: I79f7a3c849445ac8e68b6a1b9c3fda3152312b37
Reviewed-on: https://chromium-review.googlesource.com/618273
Reviewed-by: Josafat Garcia <josafat@chromium.org>
Commit-Queue: Josafat Garcia <josafat@chromium.org>
Tested-by: Josafat Garcia <josafat@chromium.org>
diff --git a/overlay-chell/make.conf b/overlay-chell/make.conf
index 1397ebe..8de109a 100644
--- a/overlay-chell/make.conf
+++ b/overlay-chell/make.conf
@@ -3,7 +3,6 @@
 # found in the LICENSE file.
 
 USE="${USE} chell cros_ec has_keyboard_backlight pd_sync"
-USE="${USE} arc"
 
 # Allow consumer kiosk.
 # NOTE: Deprecating feature. New board should NOT have it.