media: cx231xx: Increase USB bridge bandwidth

The cx231xx USB bridge has issue streaming QAM256 DVB-C channels.
QAM64 channels were fine, but QAM256 channels produced corrupted
transport streams.

cx231xx alt mode 4 does not provide enough bandwidth to acommodate
QAM256 DVB-C channels, most likely DVB-T2 channels would break up
as well. Alt mode 5 increases bridge bandwidth to 90Mbps, and
fixes QAM256 DVB-C streaming.

Signed-off-by: Brad Love <brad@nextdimension.cc>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/usb/cx231xx/cx231xx-dvb.c

@@ -276,7 +276,7 @@ static int start_streaming(struct cx231xx_dvb *dvb)
 
 	if (dev->USE_ISO) {
 		dev_dbg(dev->dev, "DVB transfer mode is ISO.\n");
-		cx231xx_set_alt_setting(dev, INDEX_TS1, 4);
+		cx231xx_set_alt_setting(dev, INDEX_TS1, 5);
 		rc = cx231xx_set_mode(dev, CX231XX_DIGITAL_MODE);
 		if (rc < 0)
 			return rc;