radv: hardcode shader WAVE_LIMIT to the maximum value

radv: hardcode shader WAVE_LIMIT to the maximum value

When WAVE_LIMIT is set, a submission will opt-in for SPI based resource
scheduling. Because this mechanism is cooperative, we must ensure that
all submissions have this field set, otherwise they will bypass resource
arbitration.

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>