anv: Enable geometry distribution

anv: Enable geometry distribution

Using recommended values based on performance studies across a range
of workloads.

Rework:
 * Always enable geometry distribution
 * Set ListCutIndexEnable if primitive restart is enabled
 * Set distribution mode based on TEEnable
 * Add comment explaining the 3DSTATE_VFG bits (Sagar)

v2:
- Emit 3DSTATE_VFG dynamically based on primitive restart (Ken)

Signed-off-by: Anuj Phogat <anuj.phogat@gmail.com>
Reviewed-by: Sagar Ghuge <sagar.ghuge@intel.com>
Reviewed-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/12091>