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/MPC832XEMDS.h b/include/configs/MPC832XEMDS.h
index 520f01f..4b3f70c 100644
--- a/include/configs/MPC832XEMDS.h
+++ b/include/configs/MPC832XEMDS.h
@@ -20,9 +20,8 @@
 /*
  * DDR Setup
  */
-#define CONFIG_SYS_DDR_BASE	0x00000000	/* DDR is system memory */
-#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	/* DDR is system memory */
+#define CONFIG_SYS_DDR_SDRAM_BASE	CONFIG_SYS_SDRAM_BASE
 #define CONFIG_SYS_DDRCDR	0x73000002	/* DDR II voltage is 1.8V */
 
 #undef CONFIG_SPD_EEPROM