Feature request: Add SDIO support for RP2040 / RP2350

[DatanoiseTV]

As part of work on the PicoADK V2 and initial CircuitPython support, I was wondering if SDIO support is coming?

This works really well earlephilhower/arduino-pico#1560 (comment)

[dhalbert]

Hi - this is a dupe of #8160.