ggml: build musa backend library

[yeahdongcn]

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target #10256

Testing Done

1. Local build using cmake -> ok
2. Local run llama-cli for one-shot inference -> ok
3. Build light-musa docker image and docker run -it -v $PWD:/ws local/llama.cpp:light-musa -> failed with error (/llama-cli: error while loading shared libraries: libggml-cpu.so: cannot open shared object file: No such file or directory)

[slaren]

Since everything else seems to be working, I will merge this now and try to fix the containers.