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/o2dnt-common.h b/include/configs/o2dnt-common.h
index 73a44a7..4ffab8a 100644
--- a/include/configs/o2dnt-common.h
+++ b/include/configs/o2dnt-common.h
@@ -253,13 +253,13 @@
 #define CONFIG_SYS_INIT_RAM_ADDR	MPC5XXX_SRAM
 #ifdef CONFIG_POST
 /* preserve space for the post_word at end of on-chip SRAM */
-#define CONFIG_SYS_INIT_RAM_END		MPC5XXX_SRAM_POST_SIZE
+#define CONFIG_SYS_INIT_RAM_SIZE	MPC5XXX_SRAM_POST_SIZE
 #else
 /* End of used area in DPRAM */
-#define CONFIG_SYS_INIT_RAM_END		MPC5XXX_SRAM_SIZE
+#define CONFIG_SYS_INIT_RAM_SIZE	MPC5XXX_SRAM_SIZE
 #endif
 
-#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