Remove config_wifi_p2p_support from config.xml.

"config_wifi_p2p_support" is no longer used.
It was replaced with PackageManager.FEATURE_WIFI_DIRECT.

Change-Id: Ib57c5246b2ad218e65b4cbbb77fd37c04b5d9682
Signed-off-by: Yoshihiko Ikenaga <yoshihiko.ikenaga@jp.sony.com>