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/board/voiceblue/setup.S b/board/voiceblue/setup.S
index cc50e8c..6dddd6b 100644
--- a/board/voiceblue/setup.S
+++ b/board/voiceblue/setup.S
@@ -26,7 +26,7 @@
 #include <version.h>
 
 _TEXT_BASE:
-	.word	TEXT_BASE	/* SDRAM load addr from config.mk */
+	.word	CONFIG_SYS_TEXT_BASE	/* SDRAM load addr from config.mk */
 
 OMAP5910_LPG1_BASE:		.word 0xfffbd000
 OMAP5910_TIPB_SWITCHES_BASE:	.word 0xfffbc800