net/mlx5: support count and age on root group

This patch enables support for count and age flow actions
in root table i.e. flow group 0, when working
with HW Steering flow engine (dv_flow_en = 2).
It depends on support in HWS layer introduced in previous patches.

Specifically this patch:

- Adjusts action validation during flow actions translation
  to allow count and age on root group.
- Adds creation and destruction of mlx5dr count action
  for use on root group.
- Adjusts count action construction (done during rule create)
  to select correct action variant based on the group
  where the rule is created.

Signed-off-by: Dariusz Sosnowski <[email protected]>
Acked-by: Bing Zhao <[email protected]>

Author: sodar

doc/guides/rel_notes/release_25_11.rst

@@ -173,6 +173,10 @@ New Features
   * Added multi-process per port.
   * Optimized code.
 
+* **Updated NVIDIA mlx5 driver.**
+
+  * Support count and age flow actions on root tables with HW Steering flow engine.
+
 * **Added PQC ML algorithms in cryptodev.**
 
   * Added PQC ML-KEM support with reference to FIPS203.