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/r2dplus.h b/include/configs/r2dplus.h
index 955f3ff..bc518db 100644
--- a/include/configs/r2dplus.h
+++ b/include/configs/r2dplus.h
@@ -49,7 +49,7 @@
 #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)
 
 #define CONFIG_SYS_LOAD_ADDR		(CONFIG_SYS_SDRAM_BASE + 32 * 1024 * 1024)
 /* Address of u-boot image in Flash */