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/phony/phony.go b/phony/phony.go
index a31d402..760b79b 100644
--- a/phony/phony.go
+++ b/phony/phony.go
@@ -49,7 +49,7 @@
 func (p *phony) AndroidMk() android.AndroidMkData {
 	return android.AndroidMkData{
 		Custom: func(w io.Writer, name, prefix, moduleDir string, data android.AndroidMkData) {
-			fmt.Fprintln(w, "\ninclude $(CLEAR_VARS)")
+			fmt.Fprintln(w, "\ninclude $(CLEAR_VARS)", " # phony.phony")
 			fmt.Fprintln(w, "LOCAL_PATH :=", moduleDir)
 			fmt.Fprintln(w, "LOCAL_MODULE :=", name)
 			data.Entries.WriteLicenseVariables(w)