Wifi: Interface provision to configure Auto Connection

Auto connection dictates capability of hand-off between LTE and Wi-Fi
network and also selection of a specific Wi-Fi network. This commit
introduces an interface to the UI to set/reset this requirement
based on which the framework shall act accordingly.

Change-Id: I759837742a3bb9e2556790bb7af2e600e26db55b
CRs-Fixed: 982864