Support latest muRISCV-NN about mlonmcu

[fpedd]

Currently, some things in MURISCV-NN might be broken. Sorry about that. Will fix that soon. Should we maybe consider always using a compatible version of MURISCV-NN and TFLM by referring to certain commits? This way changes to upstream MURISCV-NN or TFLM won't break anything.

[fpedd]

We should also agree on an esp-idf version to use. They love to introduce breaking changes between major (and sometimes minor, arrgghh) versions (somewhat offtopic, but still relevant I guess).

So instead of

espidf:
    url: "https://github.com/espressif/esp-idf.git"
    ref: master

I would suggest

    ref: release/v4.3

Or smth similar (there already is a 4.4). But 4.3 is the version I was using last.

[PhilippvK]

Good ideas, thats why the environment configuration is very useful. I would definitely pin most of those repos to a version which is known to work. However I am typically working using the dev.yml.j2 template which might still point to the latest versions to make developing new features more easy.

[PhilippvK]

Closed because TFLMC is currently not usable with latest TFLM.