Following commit 
61bd2f75, exclude unused DDR controller from
calculating RAM size for SPL boot.
Signed-off-by: Ed Swarthout <Ed.Swarthout@nxp.com>
Reviewed-by: York Sun <york.sun@nxp.com>
        info.num_ctrls = CONFIG_SYS_FSL_DDR_MAIN_NUM_CTRLS;
        info.dimm_slots_per_ctrl = CONFIG_DIMM_SLOTS_PER_CTLR;
        info.board_need_mem_reset = NULL;
+       remove_unused_controllers(&info);
 
        /* Compute it once normally. */
        total_memory = fsl_ddr_compute(&info, STEP_GET_SPD, 1);