AndroidMkEntries() returns multiple AndroidMkEntries structs

AndroidMkEntries now returns multiple AndroidMkEntires so that a module
can emit multiple Make modules if needed.

Bug: 128708192
Test: m

Change-Id: I56b6f76d22943b80329951c5acb80a1b932441ad
diff --git a/android/testing.go b/android/testing.go
index 4b55920..26f1e4d 100644
--- a/android/testing.go
+++ b/android/testing.go
@@ -403,15 +403,18 @@
 
 }
 
-func AndroidMkEntriesForTest(t *testing.T, config Config, bpPath string, mod blueprint.Module) AndroidMkEntries {
+func AndroidMkEntriesForTest(t *testing.T, config Config, bpPath string, mod blueprint.Module) []AndroidMkEntries {
 	var p AndroidMkEntriesProvider
 	var ok bool
 	if p, ok = mod.(AndroidMkEntriesProvider); !ok {
 		t.Errorf("module does not implement AndroidMkEntriesProvider: " + mod.Name())
 	}
-	entries := p.AndroidMkEntries()
-	entries.fillInEntries(config, bpPath, mod)
-	return entries
+
+	entriesList := p.AndroidMkEntries()
+	for i, _ := range entriesList {
+		entriesList[i].fillInEntries(config, bpPath, mod)
+	}
+	return entriesList
 }
 
 func AndroidMkDataForTest(t *testing.T, config Config, bpPath string, mod blueprint.Module) AndroidMkData {