Declare the headers of the ndk_library

This creates a dependency edge between the ndk_library and its headers,
which should be a no-op in regular Soong builds. This dependency edge
will be used in the Multi-tree project to export the relevant .h files into a well
known location

Formatting changes are from bpfmt

Test: m nothing
Bug: 239044713
Change-Id: Ie71caf7b8e0d5e669f7651bbaf42c0aea3c77e04
diff --git a/media/ndk/Android.bp b/media/ndk/Android.bp
index ddc71db..fded4f5 100644
--- a/media/ndk/Android.bp
+++ b/media/ndk/Android.bp
@@ -52,6 +52,9 @@
     symbol_file: "libmediandk.map.txt",
     first_version: "21",
     unversioned_until: "current",
+    export_header_libs: [
+        "libmediandk_headers",
+    ],
 }
 
 ndk_headers {
@@ -167,7 +170,7 @@
     stubs: {
         symbol_file: "libmediandk.map.txt",
         versions: ["29"],
-    }
+    },
 }
 
 cc_library {