Buttons: Allow disabling hard navigation keys

This adds support for enabling the navbar on devices with
hardware keys.
This requires that the device supports the KeyDisabler
HAF methods, and is available in the Buttons menu

Change-Id: I01bd83b312745b4a8aa3bde0cf5f02ea99a888cc
Settings: use CMHW serial number for MSim

Change-Id: I2cb7f841699d79259711309fb6fd2de00bc8da75
Settings/Wifi: Add support for Ad-hoc (IBSS) networks

If the WLAN driver can support IBSS mode, show Ad-Hoc (IBSS) networks in the
list of available Wi-Fi networks and allow to connect to or create new Ad-Hoc
networks.

This is merged and ported from CM-10.2, where it was split up into 3 commits.

Change-Id: Ib58d05d05ce00a77d5b88ee57007d38798d7b43d
Merge remote-tracking branch 'cm/cm-11.0' into cm-11.0