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: Id7f0fbd79b6df4b6021b894f2583e738c3d0a1d9
CRs-Fixed: 762408