boards: shields: adafruit: map the pins to arduino_nano_header

This maps the Arduino Rev3 header's pins expected by the shield overlay
to the real Arduino Nano header pins of the Arduino Nano 33 BLE board and
aliases the I2C and SPI interfaces accordingly.

Fixes: #43927
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@huawei.com>