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/RPXsuper.h b/include/configs/RPXsuper.h
index da962f3..ec891e4 100644
--- a/include/configs/RPXsuper.h
+++ b/include/configs/RPXsuper.h
@@ -34,7 +34,7 @@
 #undef CONFIG_SYS_SBC_BOOT_LOW
 
 /* What should the base address of the main FLASH be and how big is
- * it (in MBytes)? This must contain TEXT_BASE from board/sbc8260/config.mk
+ * it (in MBytes)? This must contain CONFIG_SYS_TEXT_BASE from board/sbc8260/config.mk
  * The main FLASH is whichever is connected to *CS0. U-Boot expects
  * this to be the SIMM.
  */