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/sbc8349.h b/include/configs/sbc8349.h
index 6bad651..709387e 100644
--- a/include/configs/sbc8349.h
+++ b/include/configs/sbc8349.h
@@ -46,9 +46,8 @@
  */
 #undef CONFIG_DDR_32BIT
 
-#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_DDR_SDRAM_CLK_CNTL	(DDR_SDRAM_CLK_CNTL_SS_EN | \
 				DDR_SDRAM_CLK_CNTL_CLK_ADJUST_075)
 #define CONFIG_DDR_2T_TIMING