anv: Set better descriptor set limits

anv: Set better descriptor set limits

Based on discussions with Jason, Ivy Bridge and Bay Trail only actually
support 16 samplers, while newer hardware can support more than the
current limit of 64. Therefore set the lower limit where needed, and
bump up to 128 for everything else. There is also a limit on the total
number of other resources of around 250.

This allows Dawn of War III to render correctly on ANV.

Signed-off-by: Alex Smith <asmith@feralinteractive.com>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>