lpac-jni: Android.bp: Move liblpac-jni.so to system_ext

libs/lpac-jni/src/main/jni/Android.bp

@@ -48,4 +48,5 @@ cc_library_shared {
         "liblpac-cjson",
     ],
     shared_libs: ["liblog"],
+    system_ext_specific: true,
 }