Specify license for the autogenerated vendor build.prop

Test: m nothing
Change-Id: I69a9489a9217e6aaeb188a9b7bd5e6d17c5b0bd9
diff --git a/fsgen/filesystem_creator.go b/fsgen/filesystem_creator.go
index 35d2e44..59470d3 100644
--- a/fsgen/filesystem_creator.go
+++ b/fsgen/filesystem_creator.go
@@ -599,12 +599,14 @@
 		Stem           *string
 		Product_config *string
 		Android_info   *string
+		Licenses       []string
 	}{
 		Name:           proptools.StringPtr(generatedModuleName(ctx.Config(), "vendor-build.prop")),
 		Vendor:         proptools.BoolPtr(true),
 		Stem:           proptools.StringPtr("build.prop"),
 		Product_config: proptools.StringPtr(":product_config"),
 		Android_info:   proptools.StringPtr(":" + androidInfoProp.Name()),
+		Licenses:       []string{"Android-Apache-2.0"},
 	}
 	vendorBuildProp := ctx.CreateModule(
 		android.BuildPropFactory,