OpenMV Feature: RTC.memory() #18960

Description

RTC.memory() working for the STM32, MIMXRT, and Alif on the machine module.

Also, standardize the RTC API on these ports. They all implement the machine API in somewhat different ways.

Code Size

No response

Implementation

I hope the MicroPython maintainers or community will implement this feature

Code of Conduct

Yes, I agree