rust/binder_rpc_test: Build on Trusty

Add rules.mk to build binderRpcTest in Rust on Trusty.

Bug: 242243245
Test: build binderRpcTest on Trusty
Change-Id: I66262b5885db52ef7adc6e58e731f52dc06773bf
diff --git a/libs/binder/trusty/build-config-usertests b/libs/binder/trusty/build-config-usertests
index d0a1fbc..72e5ff9 100644
--- a/libs/binder/trusty/build-config-usertests
+++ b/libs/binder/trusty/build-config-usertests
@@ -16,4 +16,5 @@
 
 [
     porttest("com.android.trusty.binderRpcTest"),
+    porttest("com.android.trusty.rust.binder_rpc_test.test"),
 ]