Merge "Add hidden API getDataSaverViaCmFlag() for CTS" into main am: eb33cf470d am: 312f86816d

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/2822810

Change-Id: I686130844d9165ee3abbeedda678e381f5830458
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>