Remove unused icons

Icons reported as unused by running the script "findUnusedAssets". This
script checks for any reference to a drawable in all XML and Java files.

Some _holo_light icons are removed as they are no longer in the designer
git and should not be used.

Change-Id: Ie42d13394d6d81d35fcb48f8f76c6abd4cb09ee4
20 files changed