Use OutputFilesProvider on filesystem module types

Test: CI
Bug: 339477385
Change-Id: I0902726cfef13c716d73c1abc5c9836bdcf3e10f
diff --git a/filesystem/vbmeta.go b/filesystem/vbmeta.go
index 43a2f37..0c6e7f4 100644
--- a/filesystem/vbmeta.go
+++ b/filesystem/vbmeta.go
@@ -211,6 +211,8 @@
 
 	v.installDir = android.PathForModuleInstall(ctx, "etc")
 	ctx.InstallFile(v.installDir, v.installFileName(), v.output)
+
+	ctx.SetOutputFiles([]android.Path{v.output}, "")
 }
 
 // Returns the embedded shell command that prints the rollback index
@@ -288,13 +290,3 @@
 func (v *vbmeta) SignedOutputPath() android.Path {
 	return v.OutputPath() // vbmeta is always signed
 }
-
-var _ android.OutputFileProducer = (*vbmeta)(nil)
-
-// Implements android.OutputFileProducer
-func (v *vbmeta) OutputFiles(tag string) (android.Paths, error) {
-	if tag == "" {
-		return []android.Path{v.output}, nil
-	}
-	return nil, fmt.Errorf("unsupported module reference tag %q", tag)
-}