Preserve SECONDS fields when clearing Clock Halt bit at initialisation (#77354)

[clodnut]

drivers: rtc: rtc_1307.c

Read/modify/write the CH/SECONDS register at initialisation to clear only the Clock Halt bit and only if it is set.

This prevents the SECONDS field(s) from being wiped out unconditionally at initialisation.

Fixes #77354.

[github-actions]

Hello @clodnut, and thank you very much for your first pull request to the Zephyr project!
Our Continuous Integration pipeline will execute a series of checks on your Pull Request commit messages and code, and you are expected to address any failures by updating the PR. Please take a look at our commit message guidelines to find out how to format your commit messages, and at our contribution workflow to understand how to update your Pull Request. If you haven't already, please make sure to review the project's Contributor Expectations and update (by amending and force-pushing the commits) your pull request if necessary.
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[bjarki-andreasen]

Hi, you need to squash your commits and force push the single commit, and make the header of said commit a bit more descriptive :)

[bjarki-andreasen]

Hi, could you rebase and force push? the changes are good, but CI is stuck for whatever reason :)

[bjarki-andreasen]

Nice :)

[bjarki-andreasen]

lastly, please update the signed off entry to match the user you committed with, maybe you user "clodnut" needs to updated with the name in you signed of with?

[clodnut]

lastly, please update the signed off entry to match the user you committed with, maybe you user "clodnut" needs to updated with the name in you signed of with?

Thank you. Updated (I don't believe I can re-trigger the pipeline to confirm).

[kartben]

lastly, please update the signed off entry to match the user you committed with, maybe you user "clodnut" needs to updated with the name in you signed of with?

Thank you. Updated (I don't believe I can re-trigger the pipeline to confirm).

@clodnut did you forget to (force) push your change?

[mmahadevan108]

@clodnut , can you help address the CI compliance check failures.

[kartben]

@mmahadevan108 should be good to go now

[github-actions]

Hi @clodnut!
Congratulations on getting your very first Zephyr pull request merged 🎉🥳. This is a fantastic achievement, and we're thrilled to have you as part of our community!

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Thank you for your valuable input, and we look forward to seeing more of your contributions in the future! 🪁