[s-cars] Disabling dashboard clock self-adjust feature

[Bill Noland]

Believe the Funkuhr can be disabled/enabled through VAG-COM.

Channel 19:
 XXXX0: radio off
 XXXX1: radio active

> I've had some feedback indicating that this radio-clock feature is 
> specific
> to the German model ("Funkuhr").  My German is nothing to write home 
> about,
> but I've been trying to figure this out by reading through some German web
> forums.