net/mlx5: Use secs_to_jiffies() instead of msecs_to_jiffies()

Use secs_to_jiffies() and simplify the code.

Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
Reviewed-by: Saeed Mahameed <saeed@kernel.org>
Signed-off-by: Thorsten Blum <thorsten.blum@linux.dev>
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Reviewed-by: Somnath Kotur <somnath.kotur@broadcom.com>
Link: https://patch.msgid.link/20250221085350.198024-3-thorsten.blum@linux.dev


Signed-off-by: Jakub Kicinski <kuba@kernel.org>