Rename CONFIG_SYS_TEXT_BASE to CONFIG_TEXT_BASE

The current name is inconsistent with SPL which uses CONFIG_SPL_TEXT_BASE
and this makes it imposible to use CONFIG_VAL().

Rename it to resolve this problem.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/board/freescale/ls1021atsn/ls1021atsn.c b/board/freescale/ls1021atsn/ls1021atsn.c
index f016088..245c9df 100644
--- a/board/freescale/ls1021atsn/ls1021atsn.c
+++ b/board/freescale/ls1021atsn/ls1021atsn.c
@@ -188,7 +188,7 @@
 	 * in last boot.
 	 */
 	if (is_warm_boot()) {
-		second_uboot = (void (*)(void))CONFIG_SYS_TEXT_BASE;
+		second_uboot = (void (*)(void))CONFIG_TEXT_BASE;
 		second_uboot();
 	}