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/bpf/bpf.go b/bpf/bpf.go
index a840fa3..d91180b 100644
--- a/bpf/bpf.go
+++ b/bpf/bpf.go
@@ -227,7 +227,7 @@
 			for _, obj := range bpf.objs {
 				objName := name + "_" + obj.Base()
 				names = append(names, objName)
-				fmt.Fprintln(w, "include $(CLEAR_VARS)")
+				fmt.Fprintln(w, "include $(CLEAR_VARS)", " # bpf.bpf.obj")
 				fmt.Fprintln(w, "LOCAL_MODULE := ", objName)
 				data.Entries.WriteLicenseVariables(w)
 				fmt.Fprintln(w, "LOCAL_PREBUILT_MODULE_FILE :=", obj.String())
@@ -237,7 +237,7 @@
 				fmt.Fprintln(w, "include $(BUILD_PREBUILT)")
 				fmt.Fprintln(w)
 			}
-			fmt.Fprintln(w, "include $(CLEAR_VARS)")
+			fmt.Fprintln(w, "include $(CLEAR_VARS)", " # bpf.bpf")
 			fmt.Fprintln(w, "LOCAL_MODULE := ", name)
 			data.Entries.WriteLicenseVariables(w)
 			fmt.Fprintln(w, "LOCAL_REQUIRED_MODULES :=", strings.Join(names, " "))