When wifi p2p is connected, entering Wi-Fi Direct UI won't show any peer devices
until a WIFI_P2P_PEERS_CHANGED_ACTION broadcast is received (long after or never).
Users may be confused and think p2p is disconnected. It's more user friendly to
display connected devices right at the beginning.
In addition, this CL removes the useless mWifiP2pManager.requestGroupInfo call.
Bug: 11175553
Change-Id: I0f0834043a2cf6e8fc20319e6861b62484478146