Add "packages/" to Android.mk denylist.

Bug: 318428689
Change-Id: I229fb645cdf03881ed709216dd6743d456440403
Test: CIs
diff --git a/ui/build/androidmk_denylist.go b/ui/build/androidmk_denylist.go
index bbac2db..2bad5a8 100644
--- a/ui/build/androidmk_denylist.go
+++ b/ui/build/androidmk_denylist.go
@@ -33,6 +33,7 @@
 	"kernel/tests/",
 	"libcore/",
 	"libnativehelper/",
+	"packages/",
 	"pdk/",
 	"prebuilts/",
 	"sdk/",