Wifi:Add default Lib for hidden API access

@SystemApi annotation is converted to @hide for vendor APIs. These @hide
APIs can be accessed by adding a new library
'framework-wifi-vendor-hide-access-defaults' as defaults in Android.bp.

Change-Id: I51d7bc131c48250cb1d4af409c76e437f6bde141
CRs-Fixed: 2682962
4 files changed