mpc83xx: Rename CONFIG_SYS_DDR_CONFIG and cleanup DDR csbnds code

Rename CONFIG_SYS_DDR_CONFIG to include which CS it is configuring
Cleanup the setting of the csnbds to respect the setting of
CONFIG_SYS_DDR_SDRAM_BASE
Use __ilog2 instead of writing the code to compute it
Disable unused CS configs
Ensure ddrlaw.bar is configured

Signed-off-by: Joe Hershberger <joe.hershberger@ni.com>
Cc: Joe Hershberger <joe.hershberger@gmail.com>
Signed-off-by: Kim Phillips <kim.phillips@freescale.com>
diff --git a/include/configs/sbc8349.h b/include/configs/sbc8349.h
index 4812f68..e50d829 100644
--- a/include/configs/sbc8349.h
+++ b/include/configs/sbc8349.h
@@ -114,7 +114,7 @@
  * NB: manual DDR setup untested on sbc834x
  */
 #define CONFIG_SYS_DDR_SIZE		256		/* MB */
-#define CONFIG_SYS_DDR_CONFIG		(CSCONFIG_EN \
+#define CONFIG_SYS_DDR_CS2_CONFIG	(CSCONFIG_EN \
 					| CSCONFIG_ROW_BIT_13 \
 					| CSCONFIG_COL_BIT_10)
 #define CONFIG_SYS_DDR_TIMING_1	0x36332321