[media] si4713: coding style time-related cleanups

Fix the non-whitespace checkpatch errors/warnings.
Replace msleep with usleep_range and the jiffies comparison with
time_is_after_jiffies().

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Acked-by: Eduardo Valentin <edubezval@gmail.com>
Acked-by: Dinesh Ram <dinesh.ram@cern.ch>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>