Makefile: rename TEXT_BASE to CONFIG_SYS_TEXT_BASE

Makefile

@@ -341,7 +341,7 @@ $(obj)u-boot.imx:       $(obj)u-boot.bin
 
 $(obj)u-boot.kwb:       $(obj)u-boot.bin
 		$(obj)tools/mkimage -n $(KWD_CONFIG) -T kwbimage \
-		-a $(CONFIG_SYS_TEXT_BASE) -e $(TEXT_BASE) -d $< $@
+		-a $(CONFIG_SYS_TEXT_BASE) -e $(CONFIG_SYS_TEXT_BASE) -d $< $@
 
 $(obj)u-boot.sha1:	$(obj)u-boot.bin
 		$(obj)tools/ubsha1 $(obj)u-boot.bin