boards: nrf: port to pinctrl

[gmarull]

Port all nRF nased boards to pinctrl. Overlay files have also been updated.

Note: the process has been assisted by the pinctrl_nrf_migrate.py script:

python scripts/utils/pinctrl_nrf_migrate.py -i boards/arm/${BOARD}/${BOARD}.dts --no-backup --header $'/*\n * Copyright (c) 2022 Nordic Semiconductor\n * SPDX-License-Identifier: Apache-2.0\n */\n\n'

The script handles most cases, but some required manual adjustments.

_defconfig files have been modified with this script:

from pathlib import Path

for fpath in Path(".").glob("boards/arm/**/*_defconfig"):
    lines = open(fpath).readlines()

    is_nrf = False
    for line in lines:
        if "CONFIG_SOC_SERIES_NRF" in line:
            is_nrf = True
            break

    if not is_nrf:
        continue

    lines += ["\n", "CONFIG_PINCTRL=y\n"]

    with open(fpath, "w") as f:
        f.writelines(lines)

I created a commit per board/test/sample, so that it's easier to spot issues or to later check what was done for a particular board.

[gmarull]

@jfischer-no please check this + -pinctrl.dtsi file (details in commit message)

[erwango]

+1 for shields changes