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/ms7750se.h b/include/configs/ms7750se.h
index 8c06bf2..02090f2 100644
--- a/include/configs/ms7750se.h
+++ b/include/configs/ms7750se.h
@@ -65,7 +65,7 @@
 #define CONFIG_SYS_BAUDRATE_TABLE	{ 115200, 57600, 38400, 19200, 9600 }
 
 #define CONFIG_SYS_MEMTEST_START	(CONFIG_SYS_SDRAM_BASE)
-#define CONFIG_SYS_MEMTEST_END		(TEXT_BASE - 0x100000)
+#define CONFIG_SYS_MEMTEST_END		(CONFIG_SYS_TEXT_BASE - 0x100000)
 
 /* NOR Flash */
 /* #define CONFIG_SYS_FLASH_BASE		(0xA1000000)*/