Telephony: Update Icons to Kitkat

* These are old icons from Jellybean.  This is KitKat!!!

Change-Id: I6f1fbd991d097b53139016da2812c6a6409fb82c
Mobile Network Battery Saver Mode

When idle (screen off) switching to 2G can help extend
battery life as 2G generally uses less power than 3G or LTE.

    + 30 seconds after screen turns off, set network type to 2G
    + If a music player is active (playing), do not set network to 2G
    + When device is unlocked, reset to orignial network type

Settings -> More -> Mobile Networks -> Battery saving mode