global: Finish CONFIG -> CFG migration

At this point, the remaining places where we have a symbol that is
defined as CONFIG_... are in fairly odd locations. While as much dead
code has been removed as possible, some of these locations are simply
less obvious at first. In other cases, this code is used, but was
defined in such a way as to have been missed by earlier checks.  Perform
a rename of all such remaining symbols to be CFG_... rather than
CONFIG_...

Signed-off-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/doc/develop/environment.rst b/doc/develop/environment.rst
index 0b86faf..e178346 100644
--- a/doc/develop/environment.rst
+++ b/doc/develop/environment.rst
@@ -18,7 +18,7 @@
 U_BOOT_ENV_CALLBACK macro in your board or driver code.
 
 These callbacks are associated with variables in one of two ways.  The
-static list can be added to by defining CONFIG_ENV_CALLBACK_LIST_STATIC
+static list can be added to by defining CFG_ENV_CALLBACK_LIST_STATIC
 in the board configuration to a string that defines a list of
 associations.  The list must be in the following format::