Make libbinder_ndk ll-ndk.

libbinder_ndk should always be in sync w/ system libbinder. For
instance, perhaps one day, a vendor service could talk over stable AIDL
to system.

Bug: 136027762
Bug: 138152918
Test: binderVendorDoubleLoadTest
Change-Id: I92764b07052e3e289febad144a8b3256f6a4adb1
diff --git a/libs/binder/ndk/Android.bp b/libs/binder/ndk/Android.bp
index 21bef2e..6da3086 100644
--- a/libs/binder/ndk/Android.bp
+++ b/libs/binder/ndk/Android.bp
@@ -16,7 +16,6 @@
 
 cc_library {
     name: "libbinder_ndk",
-    vendor_available: true,
 
     export_include_dirs: [
         "include_ndk",
@@ -74,3 +73,12 @@
     symbol_file: "libbinder_ndk.map.txt",
     first_version: "29",
 }
+
+llndk_library {
+    name: "libbinder_ndk",
+    symbol_file: "libbinder_ndk.map.txt",
+    export_include_dirs: [
+        "include_ndk",
+        "include_apex",
+    ],
+}