Revert "Add hidden API getDataSaverViaCmFlag() for CTS"

This reverts commit 9e87fc384a03c0091e19b58b63a495e83145c296.

Reason for revert: This change is not required now (aosp/2815393, aosp/2831370)

Change-Id: I77d5f3047f4f4ec656d6ba3d2c0781578572f8e4
1 file changed