Set hiddenSSID flag to connect to Wi-Fi AP even in stealth mode

To connect Wi-Fi AP even in stealth mode (AP name is not listed in Wi-Fi
Settings), set hiddenSSID flag in WifiConfiguration.

Bug: 37263965
Test: Connect stealth Wi-Fi AP by Nfc Wifi protected setup
Change-Id: I4e1c92aaa2f6166fae90f922be9a4d4ece86c314
1 file changed