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>

drivers/ddr/fsl/ddr2_dimm_params.c

@@ -3,9 +3,9 @@
  * Copyright 2008 Freescale Semiconductor, Inc.
  */
 
-#include <common.h>
 #include <fsl_ddr_sdram.h>
 #include <log.h>
+#include <linux/string.h>
 #include <asm/bitops.h>
 
 #include <fsl_ddr.h>