devlink: Add documentation for OcteonTx2 AF

Add documentation for the following devlink params
- npc_mcam_high_zone_percent
- npc_def_rule_cntr
- nix_maxlf

Signed-off-by: Linu Cherian <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Jakub Kicinski <[e-mail]>

Documentation/networking/devlink/octeontx2.rst

···
      - runtime
      - Use to set the quantum which hardware uses for scheduling among transmit queues.
        Hardware uses weighted DWRR algorithm to schedule among all transmit queues.
+   * - ``npc_mcam_high_zone_percent``
+     - u8
+     - runtime
+     - Use to set the number of high priority zone entries in NPC MCAM that can be allocated
+       by a user, out of the three priority zone categories high, mid and low.
+   * - ``npc_def_rule_cntr``
+     - bool
+     - runtime
+     - Use to enable or disable hit counters for the default rules in NPC MCAM.
+       Its not guaranteed that counters gets enabled and mapped to all the default rules,
+       since the counters are scarce and driver follows a best effort approach.
+       The default rule serves as the primary packet steering rule for a specific PF or VF,
+       based on its DMAC address which is installed by AF driver as part of its initialization.
+       Sample command to read hit counters for default rule from debugfs is as follows,
+       cat /sys/kernel/debug/cn10k/npc/mcam_rules
+   * - ``nix_maxlf``
+     - u16
+     - runtime
+     - Use to set the maximum number of LFs in NIX hardware block. This would be useful
+       to increase the availability of default resources allocated to enabled LFs like
+       MCAM entries for example.
 
 The ``octeontx2 PF`` driver implements the following driver-specific parameters.