Create a bp2build converter for ndk_headers

And add this module type to alwaysConvertList

Test: go test ./bp2build
Bug: 300504837
Change-Id: Ic09738ab47e7c497287b73de0f952d52aa78dd17
diff --git a/cc/testing.go b/cc/testing.go
index 21745c3..36bc261 100644
--- a/cc/testing.go
+++ b/cc/testing.go
@@ -42,7 +42,7 @@
 	ctx.RegisterModuleType("ndk_prebuilt_shared_stl", NdkPrebuiltSharedStlFactory)
 	ctx.RegisterModuleType("ndk_prebuilt_static_stl", NdkPrebuiltStaticStlFactory)
 	ctx.RegisterModuleType("ndk_library", NdkLibraryFactory)
-	ctx.RegisterModuleType("ndk_headers", ndkHeadersFactory)
+	ctx.RegisterModuleType("ndk_headers", NdkHeadersFactory)
 }
 
 func GatherRequiredDepsForTest(oses ...android.OsType) string {