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/develop/moveconfig.rst b/doc/develop/moveconfig.rst
index bfb7aff..ad8596e 100644
--- a/doc/develop/moveconfig.rst
+++ b/doc/develop/moveconfig.rst
@@ -20,10 +20,10 @@
 you are moving.
 
 Then run this tool giving CONFIG names you want to move.
-For example, if you want to move CONFIG_CMD_USB and CONFIG_SYS_TEXT_BASE,
+For example, if you want to move CONFIG_CMD_USB and CONFIG_TEXT_BASE,
 simply type as follows::
 
-  $ tools/moveconfig.py CONFIG_CMD_USB CONFIG_SYS_TEXT_BASE
+  $ tools/moveconfig.py CONFIG_CMD_USB CONFIG_TEXT_BASE
 
 The tool walks through all the defconfig files and move the given CONFIGs.