initcall: Correct use of relocation offset

The relocation offset can change in some initcall sequences. Handle
this and make sure it is used for all debugging statements in
init_run_list()

Update the trace test to match.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Caleb Connolly <caleb.connolly@linaro.org>