setcompat minsdk bump from 19 to 21 am: 5628bb3d52

Original change: https://googleplex-android-review.googlesource.com/c/platform/external/setupcompat/+/27843177

Change-Id: I9d908d6ba7c30a6f808cfa6e703cf02b604d7051
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>