bootstage: Add stubs for new bootstage functions

Some functions don't have a stub for when CONFIG_BOOTSTAGE is not defined.
Add one to avoid #ifdefs in the code when this is used in U-Boot.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Che-Liang Chiou <clchiou@chromium.org>
Reviewed-by: Tom Wai-Hong Tam <waihong@chromium.org>
1 file changed