raspberrypi: support PIO on high pins #9901
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Testing performed: on a Metro RP2350 prototype, used
neopixel_write
on pin A0 (GPIO41) & scoped it.Also, the built in neopixel still works.
Note that this does not enable USB Host on the 4-pin header, see sekigon-gonnoc/Pico-PIO-USB#133This also fixes USB Host, though it depends on an additional pull request: adafruit/Pico-PIO-USB#1 (us) or sekigon-gonnoc/Pico-PIO-USB#157 (upstream)
Closes: #9897