[AWARE] Unhide Wi-Fi Aware API (baseline)

Baseline Wi-Fi Aware API providing discovery and connectivity (data-path).

Bug: 30983968
Test: unit tests + integration (sl4a) tests passing.
Change-Id: Idd7c6a625f168717b083d5f13e291ce916571933

core/java/android/net/NetworkCapabilities.java

@@ -420,8 +420,6 @@ public final class NetworkCapabilities implements Parcelable {
 
     /**
      * Indicates this network uses a Wi-Fi Aware transport.
-     *
-     * @hide PROPOSED_AWARE_API
      */
     public static final int TRANSPORT_WIFI_AWARE = 5;