Add to System Reference demos: zephyr proposes a shell over rpmsg

[nathalie-ckc]

Discussed during 2024-02-21 OpenAMP System Reference call. Creating a GitHub issue as a reminder.

Arnaud pointed out that there is a PR in zephyr that proposes a shell over rpmsg:
"Simple to test updating the samples/subsys/ipc/openamp_rsc_table sample. it's working on the stm32mp1-dk board without hardware dependency. Not yet robust as some freezes occur. but at term could be added in the list of system reference demos
zephyrproject-rtos/zephyr#68764 "

[pdgendt]

On my board (based on mimx8mp_evk) I have no more freezes with the latest version, but it would be nice to have more boards tested.

[arnopo]

I confirm no more code freeze.
i would Be in favor of having a dedicated system reference application for this console. I wonder if we could add MicroPython to be able to run some scripts on the console (https://github.com/micropython/micropython/blob/master/ports/zephyr/README.md)