Merge "Revert "Remove shadows from launcher icons."" into sc-dev am: 78edf554 am: ec814fce am: b88d829c

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

Change-Id: Idc5ff2fd3a910a161231e6f157a888d46ff14a1e