util: add and enable F16C by default
This affects all components that use the half float conversion functions.
Drivers only have to call util_cpu_detect
once to enable F16C for the util functions.
@airlied This fixes bptc-float-modes on llvmpipe. I guess we have a bug in the conversion functions somewhere, which is no longer important because F16C is supported across many generations of CPUs.
Edited by Marek Olšák