platform/mellanox: mlxbf-pmc: add sysfs_attr_init() to count_clock init

The lock-related debug logic (CONFIG_LOCK_STAT) in the kernel is noting
the following warning when the BlueField-3 SOC is booted:

  BUG: key ffff00008a3402a8 has not been registered!
  ------------[ cut here ]------------
  DEBUG_LOCKS_WARN_ON(1)
  WARNING: CPU: 4 PID: 592 at kernel/locking/lockdep.c:4801 lockdep_init_map_type+0x1d4/0x2a0
<snip>
  Call trace:
   lockdep_init_map_type+0x1d4/0x2a0
   __kernfs_create_file+0x84/0x140
   sysfs_add_file_mode_ns+0xcc/0x1cc
   internal_create_group+0x110/0x3d4
   internal_create_groups.part.0+0x54/0xcc
   sysfs_create_groups+0x24/0x40
   device_add+0x6e8/0x93c
   device_register+0x28/0x40
   __hwmon_device_register+0x4b0/0x8a0
   devm_hwmon_device_register_with_groups+0x7c/0xe0
   mlxbf_pmc_probe+0x1e8/0x3e0 [mlxbf_pmc]
   platform_probe+0x70/0x110

The mlxbf_pmc driver must call sysfs_attr_init() during the
initialization of the "count_clock" data structure to avoid
this warning.

Fixes: 5efc800 ("platform/mellanox: mlxbf-pmc: Add support for monitoring cycle count")
Reviewed-by: Shravan Kumar Ramani <shravankr@nvidia.com>
Signed-off-by: David Thompson <davthompson@nvidia.com>
Link: https://patch.msgid.link/20251013155605.3589770-1-davthompson@nvidia.com
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>

Author: dthompso

drivers/platform/mellanox/mlxbf-pmc.c

@@ -2015,6 +2015,7 @@ static int mlxbf_pmc_init_perftype_counter(struct device *dev, unsigned int blk_
 	if (pmc->block[blk_num].type == MLXBF_PMC_TYPE_CRSPACE) {
 		/* Program crspace counters to count clock cycles using "count_clock" sysfs */
 		attr = &pmc->block[blk_num].attr_count_clock;
+		sysfs_attr_init(&attr->dev_attr.attr);
 		attr->dev_attr.attr.mode = 0644;
 		attr->dev_attr.show = mlxbf_pmc_count_clock_show;
 		attr->dev_attr.store = mlxbf_pmc_count_clock_store;