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/doc/board/nxp/mx6ul_14x14_evk.rst b/doc/board/nxp/mx6ul_14x14_evk.rst
index 8298bf8..3e57ba1 100644
--- a/doc/board/nxp/mx6ul_14x14_evk.rst
+++ b/doc/board/nxp/mx6ul_14x14_evk.rst
@@ -74,9 +74,9 @@
      SDPU: jump -addr 0x877fffc0
      SDPU: done
 
-Please note that the address above is calculated based on SYS_TEXT_BASE address:
+Please note that the address above is calculated based on TEXT_BASE address:
 
-0x877fffc0 = 0x87800000 (SYS_TEXT_BASE) - 0x40 (U-Boot proper Header size)
+0x877fffc0 = 0x87800000 (TEXT_BASE) - 0x40 (U-Boot proper Header size)
 
 Power on the target and run the following command from U-Boot root directory: