net/mlx5: Add VDPA interface type to supported enumerations

VDPA is a new interface that will be added in subsequent patches. It
uses mlx5 core devices and resources. Add an interface type for it.

Signed-off-by: Eli Cohen <eli@mellanox.com>
Reviewed-by: Parav Pandit <parav@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>

include/linux/mlx5/driver.h

@@ -1054,6 +1054,7 @@ enum {
 enum {
 	MLX5_INTERFACE_PROTOCOL_IB  = 0,
 	MLX5_INTERFACE_PROTOCOL_ETH = 1,
+	MLX5_INTERFACE_PROTOCOL_VDPA = 2,
 };
 
 struct mlx5_interface {