The debug info can not be written to trace buffer immediately
by thread. So we should sleep some seconds.
(From OE-Core rev: 5ccf8150b4c65f2feac16cc2881188f14d9e5390)
Signed-off-by: Hongzhi.Song <hongzhi.song@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>