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/board/esd/vme8349/vme8349.c b/board/esd/vme8349/vme8349.c
index a46d0b6..4c220fa 100644
--- a/board/esd/vme8349/vme8349.c
+++ b/board/esd/vme8349/vme8349.c
@@ -38,7 +38,7 @@
 		return -ENXIO;
 
 	/* DDR SDRAM - Main memory */
-	im->sysconf.ddrlaw[0].bar = CONFIG_SYS_DDR_BASE & LAWBAR_BAR;
+	im->sysconf.ddrlaw[0].bar = CONFIG_SYS_SDRAM_BASE & LAWBAR_BAR;
 
 	msize = spd_sdram();