ddr: marvell: a38x: Perform DDR training sequence again for 2nd boot

- DDR Training sequence happens very fast. The speedup in boot time is
negligible by skipping the training sequence during 2nd boot or after.
So remove the check and skip.
- This change improves the robustness of DDR training. If u-boot crashed
during DDR training, the training could be left in a limbo state, where
the BootROM has recorded that it is already in a 2nd boot. The training
must be repeated in this scenario to get out of this limbo state, but due
to the check it cannot be performed.

Signed-off-by: Tony Dinh <mibodhi@gmail.com>
Reviewed-by: Stefan Roese <sr@denx.de>

drivers/ddr/marvell/a38x/mv_ddr_plat.c

@@ -1363,13 +1363,6 @@ int mv_ddr_pre_training_soc_config(const char *ddr_type)
 			    DRAM_RESET_MASK_MASKED << DRAM_RESET_MASK_OFFS);
 	}
 
-	/* Check if DRAM is already initialized  */
-	if (reg_read(REG_BOOTROM_ROUTINE_ADDR) &
-	    (1 << REG_BOOTROM_ROUTINE_DRAM_INIT_OFFS)) {
-		printf("%s Training Sequence - 2nd boot - Skip\n", ddr_type);
-		return MV_OK;
-	}
-
 	/* Fix read ready phases for all SOC in reg 0x15c8 */
 	reg_val = reg_read(TRAINING_DBG_3_REG);