net/mlx5: DR, Fix potential shift wrapping of 32-bit value

Fix 32-bit variable shift wrapping in dr_ste_v0_get_miss_addr.

Fixes: 6b93b400 ("net/mlx5: DR, Move STEv0 setters and getters")
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Yevgeny Kliteynik <kliteyn@nvidia.com>
Reviewed-by: Alex Vesker <valex@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>