RK3588 matmul benchmark

Quick and dirty benchmarking tool to measure the performance of RK3588 NPU.

How to use

> c++ bench.cpp -o bench -lrknnrt -O3 -std=c++20
> tasket -c 4-7 ./bench

And 2 files should appear.

• result.csv - the actual performance of the matrix multiplcation itself
• init.csv - How long does it take to setup the matrix multiplcation