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WIP - Support CYW43 boards on RP2350 #2616

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WIP - Support CYW43 boards on RP2350 #2616

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earlephilhower
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Using pico-sdk develop branch with minor patch, add in support for the CYW43-based WiFi boards on the RP2350.

Fixes #2608

Using pico-sdk develop branch with minor patch, add in support for the
CYW43-based WiFi boards on the RP2350.

Fixes #2608

Rolls in dynamic SPI divider #2600
@earlephilhower
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FWIW, this should now build on the RP2350+CYW43 boards (Pimoroni PicoPlus 2W and SparkFun Thing Plus RP2350) while also not breaking PicoW. SparkFun was nice enough to send a sample, so once that arrives final tweaks can be done.

On the bright side, it appears all boards are using the same CYW43 pin out. The SDK should allow for changing it per-board, but as of now there doesn't seem to be a need to exercise this.

This also pulls in #2600 since it is trivial and part of the refactoring done to support multiple CYW43 boards.

SDK builds in CI will fail until the next SDK release (and raspberrypi/pico-sdk#2045 gets merged).

Also move "special GPIO" to 64 since the Pimoroni Pico 2W uses the
RP2350B with 48 GPIOs.
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Feature Request: Support multiple CYW43 driver configurations for RP2350
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