CVE-2025-68790 net/mlx5: Fix double unregister of HCA_PORTS component

In the Linux kernel, the following vulnerability has been resolved: net/mlx5: Fix double unregister of HCAPORTS component Clear hcadevcomcomp in device's private data after unregistering it in LAG teardown. Otherwise a slightly lagging second pass through mlx5unloadone might try to unregister it...