Update makefiles for vndk enabled.

Test: none
Bug: 63866913
Change-Id: I29174fdadca2828455ef49f14e53bc95c5238dbb
diff --git a/boot/1.0/Android.bp b/boot/1.0/Android.bp
index de42647..761a68e 100644
--- a/boot/1.0/Android.bp
+++ b/boot/1.0/Android.bp
@@ -46,6 +46,9 @@
     generated_headers: ["android.hardware.boot@1.0_genc++_headers"],
     export_generated_headers: ["android.hardware.boot@1.0_genc++_headers"],
     vendor_available: true,
+    vndk: {
+        enabled: true,
+    },
     shared_libs: [
         "libhidlbase",
         "libhidltransport",