Use OutputFilesProvider on filesystem module types

Test: CI
Bug: 339477385
Change-Id: I0902726cfef13c716d73c1abc5c9836bdcf3e10f
diff --git a/filesystem/avb_gen_vbmeta_image.go b/filesystem/avb_gen_vbmeta_image.go
index 985f0ea..a7fd782 100644
--- a/filesystem/avb_gen_vbmeta_image.go
+++ b/filesystem/avb_gen_vbmeta_image.go
@@ -81,6 +81,8 @@
 	a.output = android.PathForModuleOut(ctx, a.installFileName()).OutputPath
 	cmd.FlagWithOutput("--output_vbmeta_image ", a.output)
 	builder.Build("avbGenVbmetaImage", fmt.Sprintf("avbGenVbmetaImage %s", ctx.ModuleName()))
+
+	ctx.SetOutputFiles([]android.Path{a.output}, "")
 }
 
 var _ android.AndroidMkEntriesProvider = (*avbGenVbmetaImage)(nil)
@@ -99,16 +101,6 @@
 	}}
 }
 
-var _ android.OutputFileProducer = (*avbGenVbmetaImage)(nil)
-
-// Implements android.OutputFileProducer
-func (a *avbGenVbmetaImage) OutputFiles(tag string) (android.Paths, error) {
-	if tag == "" {
-		return []android.Path{a.output}, nil
-	}
-	return nil, fmt.Errorf("unsupported module reference tag %q", tag)
-}
-
 type avbGenVbmetaImageDefaults struct {
 	android.ModuleBase
 	android.DefaultsModuleBase