[media] dib0700: add a sleep before attempting to detect dib7000p

Add a sleep since in some cases the dib7000p wasn't online when being probed.
The optimal timing has not yet been determined.

Signed-off-by: Devin Heitmueller <[e-mail]>
Cc: Patrick Boettcher <[e-mail]>
Signed-off-by: Mauro Carvalho Chehab <[e-mail]>

drivers/media/dvb/dvb-usb/dib0700_devices.c

···
 	/* FIXME: not verified yet */
 	dib0700_ctrl_clock(adap->dev, 72, 1);
 
+	msleep(500);
+
 	if (dib7000pc_detection(&adap->dev->i2c_adap) == 0) {
 		/* Demodulator not found for some reason? */
 		return -ENODEV;