I have just returned from a tour over Europe on by motorcycle a week ago and actually went through Bergun. No where did I see any signs prohibitig photography of any sort. To be honest, the more popular Swiss towns and villages, Interlaken and Grindelwald to name just two are so busy that getting a decent image of any merit is virtually impossible there are so many people milling around.
It is most unlike the Swiss to be so techy about photographs and I cannot see this lasting or even being rigidly enforced as it will only surely damage their income during the tourist season.