net/mlx5e: fix kdoc warning on eswitch.h

net/mlx5e: fix kdoc warning on eswitch.h

Fix the following kdoc warning:
git ls-files *.[ch] | egrep drivers/net/ethernet/mellanox/mlx5/core/ |\
xargs scripts/kernel-doc --none
drivers/net/ethernet/mellanox/mlx5/core/eswitch.h:824: warning: cannot
understand function prototype: 'struct mlx5_esw_event_info '

Signed-off-by: Moshe Shemesh <moshe@nvidia.com>
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
Reviewed-by: Michal Swiatkowski <michal.swiatkowski@linux.intel.com>
Link: https://patch.msgid.link/1752675472-201445-3-git-send-email-tariqt@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>