KPU rust support

[bfabricio]

Wonderful job porting standalone SDK code to rust. I'm quite new to rust and risc-v... So far I have tested 'dvp-ov' and 'k210-console' projects on my MaixBit board and it worked as expected.
I'm wondering if there is any WIP for KPU support in rust?

[laanwj]

I looked at KPU support (this is when I wrote https://github.com/laanwj/k210-sdk-stuff/blob/master/doc/kpu.md), however the problem is that I could not find any low-level example for the KPU. This would make porting and testing a lot easier than having to port the entire NN framework around it as well at the same time. Which is quite a lot of code!