Despite our hope, devices prior to P18 just don't have the dynamic range
to give three distinct vibration intensity settings. Given this, only
show an on / off toggle for devices by default unless they explicitly
opt-in to multiple intensity levels.
Test: m -j RunSettingsRoboTests
Bug: 80243632
Change-Id: I14ece855cf20f9fa44b0648d28f89c0053be5c5f