Samples: Certificate Provisioning: add nrf52840

[szczys]

• samples: cert-provisioning: change log module name
• samples: cert-provsioning: add nRF52840

[github-actions[bot]]

Visit the preview URL for this PR (updated for commit 5d232f9):

https://golioth-zephyr-sdk-doxygen-dev--pr429-szczys-cert-prov-k53byolp.web.app

_{(expires Tue, 12 Sep 2023 14:11:45 GMT)}

_{🔥 via Firebase Hosting GitHub Action 🌎}

_{Sign: a389eefadf4b4b68a539327b3459dd66c142cf49}