migrate vibrator to silent mode settings (2/2)

Change profiles:
* remove deprecated vibrator settings
* add silent mode settings

Available modes:
* off
* vibrate
* silent

Patch Set 1:
Initial patch with plain ListPreference

Patch Set 2:
Use Checkbox + Dialog like ConnectionSettings

Patch Set 3:
Rebase

Change-Id: I227f8b00f8dc17f06c8de6716c0f34b2faf82e2c