net/mlx5: Explicitly set scheduling element and TSAR type

[ Upstream commit c88146ab ]

Ensure the scheduling element type and TSAR type are explicitly
initialized in the QoS rate group creation.

This prevents potential issues due to default values.

Fixes: 1ae258f8 ("net/mlx5: E-switch, Introduce rate limiting groups API")
Signed-off-by: Carolina Jubran <cjubran@nvidia.com>
Reviewed-by: Cosmin Ratiu <cratiu@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>