WifiHal:create_wifi_virtual_interface to check generic Iface

While creating a virtual interface, the check is performed
to decide if wlan0 is present or not. This check should be
independent of wlan0 but should be present to check if any
basic interface (wlan0/p2p0 etc.) are present.

Checked for the size of list of static interfaces to be >0
to remove dependency on wlan0.

Change-Id: I66942ba10fd12bf1013f73fbe849e3f2c94e3954
CRs-Fixed: 2644616