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/include/configs/mt8512.h b/include/configs/mt8512.h
index 964c957..5ff5541 100644
--- a/include/configs/mt8512.h
+++ b/include/configs/mt8512.h
@@ -14,7 +14,7 @@
 #define CONFIG_SYS_NONCACHED_MEMORY		SZ_1M
 
 /* Uboot definition */
-#define CONFIG_SYS_UBOOT_START			CONFIG_SYS_TEXT_BASE
+#define CONFIG_SYS_UBOOT_START			CONFIG_TEXT_BASE
 
 #define ENV_BOOT_READ_IMAGE \
 	"boot_rd_img=mmc dev 0" \