radeonsi: hardcode shader WAVE_LIMIT to the maximum value

radeonsi: hardcode shader WAVE_LIMIT to the maximum value

This is part of a cooperative scheduling approach used by radv. All
drivers in the stack must opt-in to resource arbitration, otherwise GL
based apps will be able to ignore system priorities.

We always hardcode the field to its maximum value, instead of attempting
to calculate an approximate usage. In testing, there were no benefits to
using anything other than the maximum.

Signed-off-by: Andres Rodriguez <andresx7@gmail.com>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>