Add preference for enabling root access (3/3)

 * Root over ADB is now disabled by default on non-eng builds
 * Requires support in su binary and adbd
 * Root access can be configured to use ADB only, apps only, or all

Change-Id: I132a35a31c676511db954ff19120fa6d3c795b23
Wifi: Add frequency selection for new IBSS

Allow users to select a frequency for newly created Ad-Hoc (IBSS) networks, and
show the frequency for existing IBSS.

Change-Id: Icaa09c9386967fdf0a88865ff2e64cc9b219da1f
DataUsageSummary: fix mobile data usage display for sim-less devices

- Don't assume the device has a sim card. Check for a phone number
  instead. Otherwise the mobile data usage screen will not show up
  on sim-less CDMA devices.

Change-Id: Ic6e35dc209ff05e0c89dc990ad82f4ab4d3f337d