ddr: marvell: a38x: old: Backport immutable debug settings

Backport the option to compile with immutable debug settings also to
the old implementation of the DDR3 training code.

The original PR for mv-ddr-marvell can be seen at
  https://github.com/MarvellEmbeddedProcessors/mv-ddr-marvell/pull/45/

Signed-off-by: Marek Behún <kabel@kernel.org>

drivers/ddr/marvell/a38x/old/ddr3_init.c

@@ -385,7 +385,8 @@ int ddr3_init(void)
 		return status;
 
 	/* Set log level for training lib */
-	ddr3_hws_set_log_level(DEBUG_BLOCK_ALL, DEBUG_LEVEL_ERROR);
+	if (!IS_ENABLED(CONFIG_DDR_IMMUTABLE_DEBUG_SETTINGS))
+		ddr3_hws_set_log_level(DEBUG_BLOCK_ALL, DEBUG_LEVEL_ERROR);
 
 	/* Start New Training IP */
 	status = ddr3_hws_hw_training();