WifiHAl:Create separate create/delete virtual iface functions The function wifi_add_or_remove_iface was taking care for creation and deletion of virtual Iface. Added new separate functions that will perform create and delete operations instead of one single API. Bug: 153852667 Bug: 154279995 Test: Pass wifi aware tests of CtsVerifier. CRs-Fixed: 2633140 Change-Id: I3c175b1f5a59c6d022b2db51cfc72b48582ec3cf