To solve below error:
update-alternatives: Error: not linking [...]/rootfs/bin/usleep to /bin/busybox.nosuid since [...]/rootfs/bin/usleep exists and is not a link
add using update-alternatives in usleep.
Signed-off-by: Li Zhou <li.zhou@windriver.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>