zephyr/boards/rpi_pico: Add board configuration for rpi_pico.

Although the rpi_pico can already build and run with the zephyr port, this
configuration improves it in a number of ways:
- Use the USB CDC ACM as the REPL, rather than just a UART.
- Enable I2C and SPI, and add I2C1.
- Enable a filesystem, which matches exactly the rp2 port's RPI_PICO
  configuration.  So switching between zephyr and rp2 is possible and will
  retain the filesystem.
- Make the MicroPython GC heap make the most use of the available RAM.

Signed-off-by: Damien George <damien@micropython.org>

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