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/renesas/sh7785lcr/config.mk b/board/renesas/sh7785lcr/config.mk
index 66d35cb..1a9038c 100644
--- a/board/renesas/sh7785lcr/config.mk
+++ b/board/renesas/sh7785lcr/config.mk
@@ -18,12 +18,12 @@
 # MA 02111-1307 USA
 
 #
-# TEXT_BASE refers to image _after_ relocation.
+# CONFIG_SYS_TEXT_BASE refers to image _after_ relocation.
 #
 # NOTE: Must match value used in u-boot.lds (in this directory).
 #
 sinclude $(OBJTREE)/board/$(BOARDDIR)/config.tmp
 
-ifndef TEXT_BASE
-TEXT_BASE = 0x0ff80000
+ifndef CONFIG_SYS_TEXT_BASE
+CONFIG_SYS_TEXT_BASE = 0x0ff80000
 endif