boards: arduino: nano_33_ble: Fix board pin map

Fix compliance check script.

Arduino nano BLE - connector.dtsi pin corrections

There were several pin mappings from Arduino pin to GPIO pin
which were not correct.

This includes Arduino pins: 7, 8, 18, 19, 21

Arduino NANO 33 BLE - init turn PWR LED on

default Power LED light on.

Signed-off-by: Kurt Eckhardt <kurte@rockisland.com>