Add SPI DAC support as audiobusio core module alternative for synthio#1

Copilot wants to merge 1 commit intomaintodbot/CircuitPython_Synthio_Tutorial:mainfrom

copilot/fix-ca18e202-d84a-477a-8a94-c9e6d331d6e1todbot/CircuitPython_Synthio_Tutorial:copilot/fix-ca18e202-d84a-477a-8a94-c9e6d331d6e1Copy head branch name to clipboard