Add allow rust rule for android.system.keystore2 vts tests.

Bug: 160623310
Test: N/A
Change-Id: Ie501a56c3ed6c1352fc57b5b956df6ac3f4af39f
diff --git a/rust/config/allowed_list.go b/rust/config/allowed_list.go
index 62d469e..6c70aff 100644
--- a/rust/config/allowed_list.go
+++ b/rust/config/allowed_list.go
@@ -9,6 +9,7 @@
 		"frameworks/native/libs/binder/rust",
 		"prebuilts/rust",
 		"system/extras/profcollectd",
+		"system/hardware/interfaces/keystore2",
 		"system/security",
 		"system/tools/aidl",
 	}