intel/devinfo: Add devinfo->max_scratch_ids

intel/devinfo: Add devinfo->max_scratch_ids

This consolidates several duplicated pieces of code into devinfo.
max_scratch_ids is an array that provides the max number of threads
for the rendering and compute stages.

This fixes some exceptions missed by crocus for scratch ids on haswell
and cherryview.

It also fills out devinfo->max_scratch_ids properly for stages VS
through CS on Gfx12.5. But, functionally this should not make a
difference as Gfx12.5 already uses COMPUTE for all stages.

Signed-off-by: Jordan Justen <jordan.l.justen@intel.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/12799>