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/spl.h b/include/spl.h
index 303a657..5d5c60a 100644
--- a/include/spl.h
+++ b/include/spl.h
@@ -309,7 +309,7 @@
  * spl_get_image_text_base() - get the text base of the next phase
  *
  * This returns the address that the next stage is linked to run at, i.e.
- * CONFIG_SPL_TEXT_BASE or CONFIG_SYS_TEXT_BASE
+ * CONFIG_SPL_TEXT_BASE or CONFIG_TEXT_BASE
  *
  * Return: text-base address
  */
@@ -457,7 +457,7 @@
  *
  * This sets up the given spl_image which the standard values obtained from
  * config options: CONFIG_SYS_MONITOR_LEN, CONFIG_SYS_UBOOT_START,
- * CONFIG_SYS_TEXT_BASE.
+ * CONFIG_TEXT_BASE.
  *
  * @spl_image: Image description to set up
  */