Add Preferred Network menu

This contains support for displaying Preferred Networks
list. As per 3GPP specs TS 11.11, EF PLMN sel is an elementary
file in the SIM. This contains minimum 'n' PLMN MCC & MNC
values. This information is determined by user/operator about
the preferred PLMN of the user in priority order.

Change-Id: Ia3bb8f9c1e7d4af42fab51ee9a3fbdcfdef29cc1
CRs-Fixed: 776663