Add rank_mask based on the rank number for lpddr4. This would keep the ca data training loop based on the desired rank mask value instead of looping for all values. Signed-off-by: Jagan Teki <jagan@amarulasolutions.com> Signed-off-by: YouMin Chen <cym@rock-chips.com> Reviewed-by: Kever Yang <Kever.yang@rock-chips.com>