Show module type in a module section of the Android-TARGET.mk

The first line of each section will be
```
include $(CLEAR_VARS)  # <module type>
...
```

Bug: 257037252
Test: treehugger
Change-Id: Iba586155b682fe4e1e5817d8397eda8f9d9c8789
diff --git a/java/robolectric.go b/java/robolectric.go
index 2cb0798..1d56708 100644
--- a/java/robolectric.go
+++ b/java/robolectric.go
@@ -327,7 +327,7 @@
 
 func (r *robolectricTest) writeTestRunner(w io.Writer, module, name string, tests []string) {
 	fmt.Fprintln(w, "")
-	fmt.Fprintln(w, "include $(CLEAR_VARS)")
+	fmt.Fprintln(w, "include $(CLEAR_VARS)", " # java.robolectricTest")
 	fmt.Fprintln(w, "LOCAL_MODULE :=", name)
 	fmt.Fprintln(w, "LOCAL_JAVA_LIBRARIES :=", module)
 	fmt.Fprintln(w, "LOCAL_JAVA_LIBRARIES += ", strings.Join(r.libs, " "))