V4L/DVB (6113): ivtv: udelay for the i2c bus was set too high

An udelay of 5 is sufficient for standard speed i2c busses, 10 make it
too slow.

Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>