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/gaisler/grsim_leon2/config.mk b/board/gaisler/grsim_leon2/config.mk
index 65eba1b..4d88691 100644
--- a/board/gaisler/grsim_leon2/config.mk
+++ b/board/gaisler/grsim_leon2/config.mk
@@ -26,9 +26,10 @@
 #
 
 # RUN U-BOOT FROM PROM
-TEXT_BASE = 0x00000000
+CONFIG_SYS_TEXT_BASE = 0x00000000
 
 # RUN U-BOOT FROM RAM
-#TEXT_BASE = 0x40000000
+#CONFIG_SYS_TEXT_BASE = 0x40000000
 
-PLATFORM_CPPFLAGS += -DTEXT_BASE=$(TEXT_BASE) -I$(TOPDIR)/board
+PLATFORM_CPPFLAGS += -DCONFIG_SYS_TEXT_BASE=$(CONFIG_SYS_TEXT_BASE) \
+	-I$(TOPDIR)/board