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/SBC8540.h b/include/configs/SBC8540.h
index 688f8a2..b753f26 100644
--- a/include/configs/SBC8540.h
+++ b/include/configs/SBC8540.h
@@ -324,7 +324,7 @@
 #define CONFIG_SYS_FLASH_ERASE_TOUT	200000		/* Timeout for Flash Erase (in ms)	*/
 #define CONFIG_SYS_FLASH_WRITE_TOUT	50000		/* Timeout for Flash Write (in ms)	*/
 
-#define CONFIG_SYS_MONITOR_BASE	TEXT_BASE	/* start of monitor	*/
+#define CONFIG_SYS_MONITOR_BASE	CONFIG_SYS_TEXT_BASE	/* start of monitor	*/
 
 #if 0
 /* XXX This doesn't work and I don't want to fix it */