Fix a bug where deps were missing for converted proto_library

This is just a partial fix.

Bug: 246997908
Test: Manual build //frameworks/proto_logging/stats:libstats_proto_host_proto
Change-Id: I9e4e62bce22cb68bcd7f917c57f3d1438fcec716

android/filegroup.go

@@ -120,9 +120,13 @@ func (fg *fileGroup) ConvertWithBp2build(ctx TopDownMutatorContext) {
 		ctx.CreateBazelTargetModule(props, CommonAttributes{Name: fg.Name()}, attrs)
 	} else {
 		if fg.ShouldConvertToProtoLibrary(ctx) {
+			// TODO(b/246997908): we can remove this tag if we could figure out a
+			// solution for this bug.
+			tags := []string{"manual"}
 			attrs := &ProtoAttrs{
 				Srcs:                srcs,
 				Strip_import_prefix: fg.properties.Path,
+				Tags:                tags,
 			}
 
 			ctx.CreateBazelTargetModule(