rp2040: make moving 1K of code into RAM optional - and off by default #1512
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Made the changes in commit dd035b0 optional because stealing 1K of RAM by default seems undesirable.
It is now controlled by PICO_RP2040_USB_FAST_IRQ which is 0 by default.
It is probably worth documenting what use cases the faster IRQ helps/is-required-for.