Use OutputFilesProvider on bpf

This changes makes bpf module type uses OutputFilesProvider,
instead of current OutputFileProducer for inter-module-
communication.

Test: CI
Bug: 339477385
Bug: 342406930
Change-Id: I85d1141e9f6583cc5427756107da99f56b0c7ea1

bpf/bpf.go

@@ -65,8 +65,6 @@ var PrepareForTestWithBpf = android.FixtureRegisterWithContext(registerBpfBuildC
 type BpfModule interface {
 	android.Module
 
-	OutputFiles(tag string) (android.Paths, error)
-
 	// Returns the sub install directory if the bpf module is included by apex.
 	SubDir() string
 }
@@ -213,6 +211,8 @@ func (bpf *bpf) GenerateAndroidBuildActions(ctx android.ModuleContext) {
 	}
 
 	android.SetProvider(ctx, blueprint.SrcsFileProviderKey, blueprint.SrcsFileProviderData{SrcPaths: srcs.Strings()})
+
+	ctx.SetOutputFiles(bpf.objs, "")
 }
 
 func (bpf *bpf) AndroidMk() android.AndroidMkData {
@@ -255,23 +255,10 @@ func (bpf *bpf) AndroidMk() android.AndroidMkData {
 	}
 }
 
-// Implements OutputFileFileProducer interface so that the obj output can be used in the data property
-// of other modules.
-func (bpf *bpf) OutputFiles(tag string) (android.Paths, error) {
-	switch tag {
-	case "":
-		return bpf.objs, nil
-	default:
-		return nil, fmt.Errorf("unsupported module reference tag %q", tag)
-	}
-}
-
 func (bpf *bpf) SubDir() string {
 	return bpf.properties.Sub_dir
 }
 
-var _ android.OutputFileProducer = (*bpf)(nil)
-
 func BpfFactory() android.Module {
 	module := &bpf{}