dts: bindings: ti,ads1119

[conweek]

Added io-channel-cells to the binding as is standard for the ads1x1x binding. Additionally, this prevents an issue where you cannot compile due to the length of this property being longer than expected.

[github-actions]

Hello @conweek, and thank you very much for your first pull request to the Zephyr project!
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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[github-actions]

Hi @conweek!
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!

To celebrate this milestone and showcase your contribution, we'd love to award you the Zephyr Technical Contributor badge. If you're interested, please claim your badge by filling out this form: Claim Your Zephyr Badge.

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