Add permissions javadoc

Bug: 171512333
Test: none
Change-Id: I6b7159dec4ddc69c944616ea17e99d328f2f2db5
diff --git a/location/java/android/location/LocationManager.java b/location/java/android/location/LocationManager.java
index ecdba1f..6026862 100644
--- a/location/java/android/location/LocationManager.java
+++ b/location/java/android/location/LocationManager.java
@@ -2601,6 +2601,9 @@
      * Returns the batch size (in number of Location objects) that are supported by the batching
      * interface.
      *
+     * Prior to Android S this call requires the {@link Manifest.permission#LOCATION_HARDWARE}
+     * permission.
+     *
      * @return Maximum number of location objects that can be returned
      * @deprecated Do not use
      * @hide