net/mlx5: DR, Fix postsend actions write length

net/mlx5: DR, Fix postsend actions write length

BugLink: https://bugs.launchpad.net/bugs/1870142
[ Upstream commit 692b0399a22530b2de8490bea75a7d20d59391d0 ]

Fix the send info write length to be (actions x action) size in bytes.

Fixes: 297cccebdc5a ("net/mlx5: DR, Expose an internal API to issue RDMA operations")
Signed-off-by: Hamdan Igbaria <hamdani@mellanox.com>
Reviewed-by: Alex Vesker <valex@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>