migrate vibrator to silent mode settings (1/2)

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:
Fix code style

Change-Id: Ic5ec3486070866b7358f843a0843ccd0753e8c72