wish: Support more hardware for nodes (low priority)

Upstream layer does not support much hardware:

https://git.yoctoproject.org/meta-zephyr/tree/meta-zephyr-bsp/conf/machine

Compared to upstream project:

https://docs.zephyrproject.org/latest/boards/

How trivial is to create bitbake recipes for missing ones (could it be automated ?)

Desirable hardware to be supported:

• https://docs.zephyrproject.org/latest/boards/arm/nrf21540dk_nrf52840/doc/
• https://docs.zephyrproject.org/3.1.0/boards/arm/nrf52840_mdk_usb_dongle/doc/
• https://docs.zephyrproject.org/latest/boards/arm/frdm_kw41z/doc/
• https://docs.zephyrproject.org/latest/boards/arm/nrf52840dongle_nrf52840/doc (cc: @zyga)

May this issue forwarded elsewhere

Cc: @stefanschmidt @brgl