Missing stereo dsp speaker presets for cx50 and cx100

The [CX100](https://github.com/bang-olufsen/create/blob/master/Guides/Upcycle%20CX100%20Stereo.pdf) and [CX50](https://github.com/bang-olufsen/create/blob/master/Guides/Upcycle%20CX50%20Stereo.pdf) upcycle stereo guides provide hardware instructions on how to create a stereo pair, however no stereo speaker presets are available.