net/mlx5: Fix build break

The latest merge between net and net-next introduced a complier assert in
mlx5 driver.  In hca_cap_bits older fields are kept along with newer
fields that should have replaced them.

Fixes: c02b3741

 ("Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net")
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>