Set NATIVE_TESTS executable like EXECUTABLES

* Rust test modules should have NATIVE_TESTS class,
  not EXECUTABLES, to work with atest --host.

Bug: 140938178
Test: make rust projects
Change-Id: I45c84284d894702471ea46faaa599de27ab6be51

core/soong_rust_prebuilt.mk

@@ -58,7 +58,7 @@ endif
 
 $(LOCAL_BUILT_MODULE): $(LOCAL_PREBUILT_MODULE_FILE)
 	$(transform-prebuilt-to-target)
-ifneq ($(filter EXECUTABLES,$(LOCAL_MODULE_CLASS)),)
+ifneq ($(filter EXECUTABLES NATIVE_TESTS,$(LOCAL_MODULE_CLASS)),)
 	$(hide) chmod +x $@
 endif