drivers: gnss: Fix nano parameter not being checked in __ASSERT

[michael-whg]

          str is being checked instead of nano

Originally posted by @michael-whg in #61073 (comment)

[github-actions]

Hello @michael-whg, and thank you very much for your first pull request to the Zephyr project!
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[ycsin]

Spotted some potential ROM size savings - out of the scope of this PR though, feel free to push another commit for this

[ycsin]

Suggested change

	__ASSERT(str != NULL, "str argument must be provided");
	__ASSERT(str != NULL, "nano argument must be provided");
	__ASSERT(nano != NULL, "nano argument must be provided");
	__ASSERT(str != NULL, "%s argument must be provided", "str");
	__ASSERT(nano != NULL, "%s argument must be provided", "nano");

[ycsin]

@michael-whg please fix the signed-off

[fabiobaltieri]

@michael-whg thanks for following up on this

[github-actions]

Hi @michael-whg!
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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