logging: add log_output_timestamp_to_us() helper function

So far we only have log_msg_timestamp_get() function, which returns
internal timestamp representation. This is either clock cycles or uptime
in ms, depending on main clock precision.

Introduce log_output_timestamp_to_us() helper function, which allows to
convert internal logging timestamp to us.

Signed-off-by: Marcin Niestroj <m.niestroj@grinn-global.com>
2 files changed