Remove llndk_headers module

Use a cc_library_headers module with llndk.llndk_headers: true instead
of an llndk_headers module.

Bug: 170784825
Test: m checkbuild
Test: compare out/soong/build.ninja
Change-Id: I6717ab613adde20652f6e861ca7179e202e63a83
diff --git a/vulkan/libvulkan/Android.bp b/vulkan/libvulkan/Android.bp
index d4cb928..440c5b1 100644
--- a/vulkan/libvulkan/Android.bp
+++ b/vulkan/libvulkan/Android.bp
@@ -34,7 +34,7 @@
     llndk: {
         symbol_file: "libvulkan.map.txt",
         export_llndk_headers: [
-            "vulkan_headers_llndk",
+            "vulkan_headers",
         ],
     },
     clang: true,