Draft: Add symbol for Raspberry Pi Compute module 4
RPI 4 CM Datasheet/Pin layout: https://datasheets.raspberrypi.com/cm4/cm4-datasheet.pdf (page 17, Chapter 4)
SOQuartz: https://files.pine64.org/doc/quartz64/SOQuartz_SOM_schematic_v1.1_20210816.pdf (page 18)
Footprint: kicad-footprints!3388
Edited by Petr Hodina