mpc83xx: Get rid of CONFIG_SYS_DDR_BASE

CONFIG_SYS_DDR_BASE is specific to mpc83xx an is always set to the same
value as CONFIG_SYS_SDRAM_BASE. Just use CONFIG_SYS_SDRAM_BASE instead.

Signed-off-by: Mario Six <mario.six@gdsys.cc>
diff --git a/include/configs/ids8313.h b/include/configs/ids8313.h
index 174c181..504a136 100644
--- a/include/configs/ids8313.h
+++ b/include/configs/ids8313.h
@@ -51,9 +51,8 @@
 /*
  * DDR Setup
  */
-#define CONFIG_SYS_DDR_BASE		0x00000000
-#define CONFIG_SYS_SDRAM_BASE		CONFIG_SYS_DDR_BASE
-#define CONFIG_SYS_DDR_SDRAM_BASE	CONFIG_SYS_DDR_BASE
+#define CONFIG_SYS_SDRAM_BASE		0x00000000
+#define CONFIG_SYS_DDR_SDRAM_BASE	CONFIG_SYS_SDRAM_BASE
 
 /*
  * Manually set up DDR parameters,