RTC: MAX31331: Support and documentation for RTC MAX31331

[SwaroopPKADI]

PR Description

• RTC: MAX31331: Support for MAX31331 and updated the documents.

PR Type

• [ ] Bug fix (a change that fixes an issue)
• [x] New feature (a change that adds new functionality)
• [ ] Breaking change (a change that affects other repos or cause CIs to fail)

PR Checklist

• [x] I have conducted a self-review of my own code changes
• [x] I have tested the changes on the relevant hardware
• [ ] I have updated the documentation outside this repo accordingly (if there is the case)