common/mlx5: fix void parameters in glue wrappers

common/mlx5: fix void parameters in glue wrappers

Following two errors are reported when compiled with
gcc (GCC) 8.3.1 20191121 (Red Hat 8.3.1-5).

drivers/common/mlx5/linux/mlx5_glue.h:188:2:
error: function declaration isn't a prototype [-Werror=strict-prototypes]

drivers/common/mlx5/linux/mlx5_glue.h:188:2:
error: function declaration isn't a prototype [-Werror=strict-prototypes]

Fix them by adding void data type in empty argument list.

Fixes: 34fa7c0268e7 ("net/mlx5: add drop action to Direct Verbs E-Switch")
Fixes: 400d985eb586 ("net/mlx5: add VLAN push/pop DR commands to glue")
Cc: stable@dpdk.org
Signed-off-by: Parav Pandit <parav@mellanox.com>
Acked-by: Matan Azrad <matan@mellanox.com>