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/android/allowlists/allowlists.go b/android/allowlists/allowlists.go
index 94503dd..da4f72a 100644
--- a/android/allowlists/allowlists.go
+++ b/android/allowlists/allowlists.go
@@ -941,6 +941,7 @@
 		"license",
 		"linker_config",
 		"ndk_library",
+		"ndk_headers",
 		"sysprop_library",
 		"xsd_config",
 	}