rp2/boards: Add pin CSV files to board definitions.

Pin defines are:
- For Pico define board pins and the default LED pin (WL_GPIO25).
- For Pico-W define board pins, external pins and the default
  LED pin (WL_GPIO0).
- For the Nano-RP2040, define board pins, external pins and
  the default LED pin (GPIO25)
- For all other boards, the pins.csv defines the LED pin (if any)
  for backwards compatibility with code that assumes there's always
  an LED pin.

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