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/MPC8313ERDB.h b/include/configs/MPC8313ERDB.h
index 21771fd..31503af 100644
--- a/include/configs/MPC8313ERDB.h
+++ b/include/configs/MPC8313ERDB.h
@@ -130,7 +130,7 @@
  * seem to have the SPD connected to I2C.
  */
 #define CONFIG_SYS_DDR_SIZE	128		/* MB */
-#define CONFIG_SYS_DDR_CONFIG	(CSCONFIG_EN \
+#define CONFIG_SYS_DDR_CS0_CONFIG	(CSCONFIG_EN \
 				| CSCONFIG_ODT_RD_NEVER \
 				| CSCONFIG_ODT_WR_ONLY_CURRENT \
 				| CSCONFIG_ROW_BIT_13 \