statsd: mark libstats_jni as jni_libs

This helps the build system to convey the information to linkerconfig so
that jni_libs are available via libnativeloader.

Bug: 150767721
Test: presubmit
Change-Id: Ie32e88355828c8f696cce9d128eebb6da70026f1

apex/statsd/Android.bp

@@ -19,8 +19,10 @@ apex {
 }
 
 apex_defaults {
-    native_shared_libs: [
+    jni_libs: [
         "libstats_jni",
+    ],
+    native_shared_libs: [
         "libstatspull",
         "libstatssocket",
     ],