KeyboardSettings: Add a RemotePreference for device-specific panel

Allow devices to provide advanced keyboard settings.

Unfortunatelly this can't be done with existing IA settings,
so use the RemotePreference API to allow the external app
to update the view. The action for this is:

     "org.lineageos.settings.device.ADVANCED_KEYBOARD_SETTINGS"

Change-Id: I1c46d3568c4d5bfc78e1cbae033071c7641fdf29