bp2build: convert host & prebuilt header libraries

Test: bp2build.sh
Change-Id: If8165eac7c17c4eef3686067257aa792121db59d
diff --git a/cc/library_headers.go b/cc/library_headers.go
index 70e4715..064e2b8 100644
--- a/cc/library_headers.go
+++ b/cc/library_headers.go
@@ -104,6 +104,8 @@
 func prebuiltLibraryHeaderFactory() android.Module {
 	module, library := NewPrebuiltLibrary(android.HostAndDeviceSupported, "")
 	library.HeaderOnly()
+	module.bazelable = true
+	module.bazelHandler = &ccLibraryBazelHandler{module: module}
 	return module.Init()
 }