[media] Technisat SkyStar USB HD,(DVB-S/S2) too much URBs for arm devices

Using 8 URBs results in a consecutive buffer allocation of too much
memory for some arm devices.
As we use isochronuous transfers the number of URBs can be reduced
without risking data-loss.
Signed-off-by: Christian Loepke <loepke@edfritsch.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

drivers/media/usb/dvb-usb/technisat-usb2.c

@@ -707,7 +707,7 @@ static struct dvb_usb_device_properties technisat_usb2_devices = {
 
 			.stream = {
 				.type = USB_ISOC,
-				.count = 8,
+				.count = 4,
 				.endpoint = 0x2,
 				.u = {
 					.isoc = {