net/mlx5: Add Crdump support

Crdump allows the driver to retrieve a dump of the FW PCI crspace.
This is useful in case of catastrophic issues which may require FW
reset. The crspace dump can be used for later debug.

Signed-off-by: Alex Vesker <valex@mellanox.com>
Signed-off-by: Moshe Shemesh <moshe@mellanox.com>
Reviewed-by: Feras Daoud <ferasda@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>