Merge "Revert "Remove shadows from launcher icons."" into sc-dev am: 78edf554ae

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/libs/systemui/+/14626350

Change-Id: Idb175f64a561e91ed4ed6cea7acc1a70fa346181
tree: 76b152837c3ce62a723e2ee530579d8d3835cbb3
  1. iconloaderlib/
  2. searchuilib/