llvmpipe: bump LP_MAX_THREADS to all available CPU cores/threads
Related PR: !18415 (merged)
This branch fixed more correct definition all cores/threads, all configurations that have more than 32 threads/cores are idle and do not use all for threads llvmpipe.
This fixes my same issue on Linux platforms: #11917
I was informed that this will not significantly increase fps because llvmpipe driver is more single-threaded, but const static limit is bad.