trace: Move trace_clocks description above record offset calculation

Flyrecord tracing data are page aligned that's why it is necessary to
calculate alignment properly. Because trace_clocks description is the part
of record length it is necessary to have information about length earlier.

Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Michal Simek <michal.simek@amd.com>
Link: https://lore.kernel.org/r/d3853d91b6fa7e3a1e5c24dd3c17335cf0041b5b.1694779918.git.michal.simek@amd.com