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/arm/cpu/arm920t/at91rm9200/lowlevel_init.S b/arch/arm/cpu/arm920t/at91rm9200/lowlevel_init.S
index d8bb960..2e7160f 100644
--- a/arch/arm/cpu/arm920t/at91rm9200/lowlevel_init.S
+++ b/arch/arm/cpu/arm920t/at91rm9200/lowlevel_init.S
@@ -43,9 +43,9 @@
 _MTEXT_BASE:
 #undef START_FROM_MEM
 #ifdef START_FROM_MEM
-	.word	TEXT_BASE-PHYS_FLASH_1
+	.word	CONFIG_SYS_TEXT_BASE-PHYS_FLASH_1
 #else
-	.word	TEXT_BASE
+	.word	CONFIG_SYS_TEXT_BASE
 #endif
 
 .globl lowlevel_init