ac/debug: take ASIC generation into account when printing registers

ac/debug: take ASIC generation into account when printing registers

There were some overlapping changes in gfx9 especially in the CB/DB
blocks which made register dumps rather misleading.

The split is along the lines of the header files, so we'll print VI-only
fields on SI and CI, for example, but we won't print GFX9 fields on
SI/CI/VI, and we won't print SI/CI/VI fields on GFX9.

Acked-by: Marek Olšák <marek.olsak@amd.com>