4xx: add missing CONFIG_SYS_SRAM_SIZE definition

A number of boards define CONFIG_SYS_SRAM_BASE but fail to define
CONFIG_SYS_SRAM_SIZE which is needed when cleaning up the code that
prints this information with the bdinfo command.

Add the missing deinitions.

Signed-off-by: Wolfgang Denk <wd@denx.de>
Cc: Stefan Roese <sr@denx.de>
Acked-by: Stefan Roese <sr@denx.de>
diff --git a/include/configs/t3corp.h b/include/configs/t3corp.h
index b38886b..41ee15b 100644
--- a/include/configs/t3corp.h
+++ b/include/configs/t3corp.h
@@ -86,6 +86,7 @@
 
 #define CONFIG_SYS_OCM_BASE		0xE7000000	/* OCM: 64k */
 #define CONFIG_SYS_SRAM_BASE		0xE8000000	/* SRAM: 256k */
+#define CONFIG_SYS_SRAM_SIZE		(256 << 10)
 #define CONFIG_SYS_LOCAL_CONF_REGS	0xEF000000
 
 #define CONFIG_SYS_PERIPHERAL_BASE	0xEF600000	/* internal periph. */