radv: enable primitive binning by default

radv: enable primitive binning by default

After doing a bunch of benchmarks, primitive binning helps
some games like The Talos Principle (+5%) or Serious Sam 2017
(+3%). For other titles, either it doesn't change anything or
it hurts very few (less than 1%).

This only affects GFX9.

Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>