display: VNDK header fixes

Change-Id: Id7604ac803e49940aa2b49e106b414b4be1a25ad
diff --git a/Android.bp b/Android.bp
index b1e6afd..ef4b3af 100644
--- a/Android.bp
+++ b/Android.bp
@@ -28,6 +28,8 @@
         "sdm/include",
         "gralloc",
     ],
+    header_libs: ["libhardware_headers"],
+    export_header_lib_headers: ["libhardware_headers"],
 }
 
 subdirs = [