[riot-notifications] [RIOT-OS/RIOT] drivers: add support for DS3231 RTC (#15245)

[J. David Ibáñez]

Tested with the feather-m0 board and https://www.adafruit.com/product/3028 

```
$ BOARD=feather-m0 make -C tests/driver_ds3231 all flash test
[...]
Welcome to pyterm!
Type '/exit' to exit.
This is Rma
shell: command not found: main():
> test
 
>  test
testing device now
OK

make: Leaving directory '/home/jdavid/sandboxes/UiO/RIOT/tests/driver_ds3231'
```

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