regex/mlx5: fix type of setup constants

regex/mlx5: fix type of setup constants

The constant representing the size of the metadata is defined as a
regular number (32-bit signed), even though all of its uses request an
unsigned int variable.
Similarly the constant representing the maximal output is also defined
as a regular number, even though all of its uses request an unsigned int
variable.

Change the type of the above constants to unsigned.

Fixes: 5f41b66d12cd ("regex/mlx5: setup fast path")
Cc: stable@dpdk.org
Signed-off-by: Michael Baum <michaelba@nvidia.com>
Acked-by: Ori Kam <orika@nvidia.com>