Rename TEXT_BASE into CONFIG_SYS_TEXT_BASE

The change is currently needed to be able to remove the board
configuration scripting from the top level Makefile and replace it by
a simple, table driven script.

Moving this configuration setting into the "CONFIG_*" name space is
also desirable because it is needed if we ever should move forward to
a Kconfig driven configuration system.

Signed-off-by: Wolfgang Denk <wd@denx.de>
diff --git a/include/configs/mecp5123.h b/include/configs/mecp5123.h
index a26de0b..fe32bb2 100644
--- a/include/configs/mecp5123.h
+++ b/include/configs/mecp5123.h
@@ -210,7 +210,7 @@
 #define CONFIG_SYS_GBL_DATA_OFFSET	(CONFIG_SYS_INIT_RAM_END - CONFIG_SYS_GBL_DATA_SIZE)
 #define CONFIG_SYS_INIT_SP_OFFSET	CONFIG_SYS_GBL_DATA_OFFSET
 
-#define CONFIG_SYS_MONITOR_BASE		TEXT_BASE	/* Start of monitor */
+#define CONFIG_SYS_MONITOR_BASE		CONFIG_SYS_TEXT_BASE	/* Start of monitor */
 #define CONFIG_SYS_MONITOR_LEN		(256 * 1024)	/* Monitor length */
 #define CONFIG_SYS_MALLOC_LEN		(6 * 1024 * 1024) /* Malloc size */