platform/mellanox: mlxbf-pmc: Fix event typo

Had a duplicate event typo, so just fixed the 1 character typo.

Fixes: 1a218d31 ("platform/mellanox: mlxbf-pmc: Add Mellanox BlueField PMC driver")
Signed-off-by: James Hurley <jahurley@nvidia.com>
Reviewed-by: David Thompson <davthompson@nvidia.com>
Reviewed-by: Shravan Kumar Ramani <shravankr@nvidia.com>
Link: https://lore.kernel.org/r/aadacdbbd3186c55e74ea9456fe011b77938eb6c.1670535330.git.jahurley@nvidia.com


Signed-off-by: Hans de Goede <hdegoede@redhat.com>