Autoload encryption classes although they have the wrong namespace

@schiesbn @DeepDiver1975 @LukasReschke @MorrisJobke 
seriously - we will not fix this by such a workaround - please change the namespaces accordingly. Classes within OCA/ namespace are to be considered private anyhow - no other app shall break. It is already questionable why OCA\encryption is used outside the encryption app ....