I found a solution for my problem. In the boot\config.txt I wrote dtoverlay=spi1-3cs to activate SPI1. After that I changed in the hyperion.config.json file "output" : "/dev/spidev0.0" to "output" : "/dev/spidev1.0". Now Hyperion uses Pins GPIO20 (MOSI) and GPIO21 (SCKL).