Merge "Adjust smallestScreenWidthDp for letterbox" into tm-qpr-dev am: f6aac7b5 am: 6b33d708

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



Change-Id: Ifc679d5c30bc1d71dac380d0aa751b53ee618735
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>