Adding gitignore and remoing unwanted files from git am: 6cb0317b21 am: 7ba411c7ed am: 4fcec24e32

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/libs/systemui/+/11370342

Change-Id: I0a1531e39842dba35f75d15ba7f53f725e0f2fc1
tree: e21a512fee75b098efbdf4324d7fbf9e6caa7ed3
  1. iconloaderlib/