[media] msi3101: fix stream re-start halt

Restarting stream fails quite often. Small delay is between urb killing
and stream stop command - likely to give harware some time to process
killed urbs.

Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>