ddr: Remove <common.h> and add needed includes

Remove <common.h> from this driver directory and when needed
add missing include files directly.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/drivers/ddr/fsl/fsl_ddr_gen4.c b/drivers/ddr/fsl/fsl_ddr_gen4.c
index f8d1468..31c58d9 100644
--- a/drivers/ddr/fsl/fsl_ddr_gen4.c
+++ b/drivers/ddr/fsl/fsl_ddr_gen4.c
@@ -4,7 +4,7 @@
  * Copyright 2021 NXP
  */
 
-#include <common.h>
+#include <config.h>
 #include <env.h>
 #include <log.h>
 #include <asm/io.h>