swr/rast: Rework thread binding parameters for machine partitioning

swr/rast: Rework thread binding parameters for machine partitioning

Add BASE_NUMA_NODE, BASE_CORE, BASE_THREAD parameters to
SwrCreateContext.

Add optional SWR_API_THREADING_INFO parameter to SwrCreateContext to
control reservation of API threads.

Add SwrBindApiThread() function to allow binding of API threads to
reserved HW threads.

Reviewed-by: Bruce Cherniak <bruce.cherniak@intel.com>