Fix doc build - ScanResult is exposing PassointInfo which is still hidden

Hiding the passpoint information for now.

Change-Id: Ic3cbb84d251478af687d9d46e2276115c8ebef18

wifi/java/android/net/wifi/ScanResult.java

@@ -81,6 +81,7 @@ public class ScanResult implements Parcelable {
     /**
      * Passpoint ANQP information. This is not fetched automatically.
      * Use {@link PasspointManager#requestAnqpInfo} to request ANQP info.
+     * {@hide}
      */
     public PasspointInfo passpoint;