net/mlx5e: Disable TLS offload for uplink representor

TLS offload is not supported in switchdev mode.

Fixes: 7a9fb35e

 ("net/mlx5e: Do not reload ethernet ports when changing eswitch mode")
Signed-off-by: Roi Dayan <roid@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>