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/arch/i386/lib/board.c b/arch/i386/lib/board.c
index 1129918..30cb9a2 100644
--- a/arch/i386/lib/board.c
+++ b/arch/i386/lib/board.c
@@ -221,8 +221,8 @@
 	re_end = (Elf32_Rel *)(rel_dyn_end + ((gd_t *)gdp)->load_off);
 
 	do {
-		if (re_src->r_offset >= TEXT_BASE)
-			if (*(Elf32_Addr *)(re_src->r_offset - rel_offset) >= TEXT_BASE)
+		if (re_src->r_offset >= CONFIG_SYS_TEXT_BASE)
+			if (*(Elf32_Addr *)(re_src->r_offset - rel_offset) >= CONFIG_SYS_TEXT_BASE)
 				*(Elf32_Addr *)(re_src->r_offset - rel_offset) -= rel_offset;
 	} while (re_src++ < re_end);