Generate tradefed config for rust device tests.

* The RustBinaryTest runner and device test config template
  are derived from GTest. Device tests are pushed to /data/local/tmp.

Bug: 140938178
Test: make unicode-xid projects; run atest
Change-Id: Idb4cab7872b48c6e25bc59b85aa6d9dece4383ec
diff --git a/tradefed/config.go b/tradefed/config.go
index 8249ffe..a289073 100644
--- a/tradefed/config.go
+++ b/tradefed/config.go
@@ -31,6 +31,7 @@
 	pctx.SourcePathVariable("NativeHostTestConfigTemplate", "build/make/core/native_host_test_config_template.xml")
 	pctx.SourcePathVariable("NativeTestConfigTemplate", "build/make/core/native_test_config_template.xml")
 	pctx.SourcePathVariable("PythonBinaryHostTestConfigTemplate", "build/make/core/python_binary_host_test_config_template.xml")
+	pctx.SourcePathVariable("RustDeviceTestConfigTemplate", "build/make/core/rust_device_test_config_template.xml")
 	pctx.SourcePathVariable("RustHostTestConfigTemplate", "build/make/core/rust_host_test_config_template.xml")
 
 	pctx.SourcePathVariable("EmptyTestConfig", "build/make/core/empty_test_config.xml")