Make sure vibration previews in Settings apply latest intensities

Update the Settings app to enforce fresh settings are applied to preview
vibrations triggered after the intensity is updated.

Add preview haptics to main switch, only when touch feedback is enabled,
and to the "apply ramping ringer" toggle for consistency with the rest
of the screen, using ringtone intensity for preview.

Bug: 219693646
Bug: 219695212
Bug: 157533521
Test: manual
Change-Id: I872a75d6b00dffae943b0f403185a39047909884