net/mlx5: Fix peer pf disable hca command

The command was mistakenly using enable_hca in embedded CPU field.

Fixes: 22e939a9 (net/mlx5: Update enable HCA dependency)
Signed-off-by: Bodong Wang <bodong@mellanox.com>
Reported-by: Alex Rosenbaum <alexr@mellanox.com>
Signed-off-by: Alex Rosenbaum <alexr@mellanox.com>
Reviewed-by: Daniel Jurgens <danielj@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>