RDMA/mlx4: Move flag constants to uapi header

MLX4_USER_DEV_CAP_LARGE_CQE (via mlx4_ib_alloc_ucontext_resp.dev_caps)
and MLX4_IB_QUERY_DEV_RESP_MASK_CORE_CLOCK_OFFSET (via
mlx4_uverbs_ex_query_device_resp.comp_mask) are copied directly to
userspace and form part of the uAPI.

Move them to the uapi header where they belong.

Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>