configs: Delete obsolete macro, CONFIG_SYS_GBL_DATA_SIZE

CONFIG_SYS_GBL_DATA_SIZE is not used any more.
The size of struct "global_data" is automatically calculated
by asm-offsets. (See lib/asm-offsets.c)

GENERATED_GBL_DATA_SIZE should be used instead of
CONFIG_SYS_GBL_DATA_SIZE.

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
diff --git a/include/configs/M54418TWR.h b/include/configs/M54418TWR.h
index de063b7..031672e 100644
--- a/include/configs/M54418TWR.h
+++ b/include/configs/M54418TWR.h
@@ -268,10 +268,8 @@
 /* End of used area in internal SRAM */
 #define CONFIG_SYS_INIT_RAM_SIZE	0x10000
 #define CONFIG_SYS_INIT_RAM_CTRL	0x221
-/* size in bytes reserved for initial data */
-#define CONFIG_SYS_GBL_DATA_SIZE	256
 #define CONFIG_SYS_GBL_DATA_OFFSET	((CONFIG_SYS_INIT_RAM_SIZE - \
-					CONFIG_SYS_GBL_DATA_SIZE) - 32)
+					GENERATED_GBL_DATA_SIZE) - 32)
 #define CONFIG_SYS_INIT_SP_OFFSET	CONFIG_SYS_GBL_DATA_OFFSET
 #define CONFIG_SYS_SBFHDR_DATA_OFFSET	(CONFIG_SYS_INIT_RAM_SIZE - 32)