Merge "Adjust smallestScreenWidthDp for letterbox" into tm-qpr-dev am: f6aac7b5

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/19196314



Change-Id: I3c7e2d64a455d0864f84c1801766a36515ca0855
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>