GlowPadView : Re-enable magneticTargets

Re-enable magneticTargets and add logic to make it
compatible with lockscreen shortcuts.

Change-Id: I523141f03566804888fde08a116f73ea62ca523e
systemui: modify hdpi & xhdpi drawables for battery_min

* These drawables are to large for the new phablet ui. See screenshot:
  http://i.imgur.com/AR8BUH8.png This change modifies the hdpi and xhdpi
  drawables to the sw720p-mdpi drawables, which look correct in the status
  bar.
Fix