codec2: libcodec2-internal-defaults to include internal headers

Bug: 149487982
Test: builds
Change-Id: I765d0627e1122b4bbc2f5f825593f0893f2226cb
diff --git a/media/codec2/vndk/Android.bp b/media/codec2/vndk/Android.bp
index 51d6ffa..f3e37e0 100644
--- a/media/codec2/vndk/Android.bp
+++ b/media/codec2/vndk/Android.bp
@@ -95,6 +95,10 @@
     name: "libcodec2-internal-defaults",
     defaults: ["libcodec2-impl-defaults"],
 
+    header_libs: [
+        "libcodec2_internal",
+    ],
+
     shared_libs: [
         "libcutils", // for properties
     ],