powerpc: Replace CONFIG_SYS_INIT_RAM_END with CONFIG_SYS_INIT_RAM_SIZE

CONFIG_SYS_INIT_RAM_SIZE may be used out of the board header file.
Some boards use CONFIG_SYS_INIT_RAM_END for the same purpose. To
unify the macros, use CONFIG_SYS_INIT_RAM_SIZE for all.

Signed-off-by: York Sun <york.sun@nxp.com>
CC: Mario Six <mario.six@gdsys.cc>
Acked-by: Stefan Roese <sr@denx.de>
Acked-by: Anatolij Gustschin <agust@denx.de>
diff --git a/include/configs/BSC9131RDB.h b/include/configs/BSC9131RDB.h
index 9c32a01..e870ffe 100644
--- a/include/configs/BSC9131RDB.h
+++ b/include/configs/BSC9131RDB.h
@@ -215,9 +215,9 @@
 
 #define CONFIG_SYS_INIT_RAM_LOCK
 #define CONFIG_SYS_INIT_RAM_ADDR	0xffd00000	/* stack in RAM */
-#define CONFIG_SYS_INIT_RAM_END		0x00004000/* End of used area in RAM */
+#define CONFIG_SYS_INIT_RAM_SIZE	0x00004000/* End of used area in RAM */
 
-#define CONFIG_SYS_GBL_DATA_OFFSET	(CONFIG_SYS_INIT_RAM_END \
+#define CONFIG_SYS_GBL_DATA_OFFSET	(CONFIG_SYS_INIT_RAM_SIZE \
 						- GENERATED_GBL_DATA_SIZE)
 #define CONFIG_SYS_INIT_SP_OFFSET	CONFIG_SYS_GBL_DATA_OFFSET