Rust: allow system/security

Bug: 160623310
Test: None
Change-Id: I00ddb0fb26e7e67f832fb321186f7313209c2669
diff --git a/rust/config/allowed_list.go b/rust/config/allowed_list.go
index 0204cd2..9c9a136 100644
--- a/rust/config/allowed_list.go
+++ b/rust/config/allowed_list.go
@@ -7,6 +7,7 @@
 		"external/crosvm",
 		"external/adhd",
 		"prebuilts/rust",
+		"system/security",
 	}
 
 	RustModuleTypes = []string{