Update allowlist for partner branches am: 3c3748a4fe

Original change: https://android-review.googlesource.com/c/platform/build/soong/+/3557572

Change-Id: I6a83f6c46c87e3516ed7f8799c7c10e3628a123e
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>
diff --git a/ui/build/androidmk_denylist.go b/ui/build/androidmk_denylist.go
index 4134cf5..8266654 100644
--- a/ui/build/androidmk_denylist.go
+++ b/ui/build/androidmk_denylist.go
@@ -62,6 +62,7 @@
 var androidmk_allowlist []string = []string{
 	"art/Android.mk",
 	"bootable/deprecated-ota/updater/Android.mk",
+	"tools/vendor/google_prebuilts/arc/Android.mk",
 }
 
 func getAllLines(ctx Context, filename string) []string {