staging: media: cxd2099: use usleep_range()

This patch fixes checkpatch.pl warning in file cxd2099.c
WARNING : msleep < 20ms can sleep for up to 20ms; see Documentation/timers/timers-howto.txt

Signed-off-by: Tapasweni Pathak <tapaswenipathak@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>