V4L/DVB (4013): Change the sweeprate for TT C1500 using QAM64

This patch changes the sweeprate for TT C1500 using QAM64.
It has been proven to work using QAM64 at a SRate of 6875 for the two
Signed-off-by: NMauro Carvalho Chehab <mchehab@infradead.org>

drivers/media/dvb/frontends/stv0297.c

@@ -401,7 +401,7 @@ static int stv0297_set_frontend(struct dvb_frontend *fe, struct dvb_frontend_par
 	case QAM_32:
 	case QAM_64:
 		delay = 100;
-		sweeprate = 1500;
+		sweeprate = 1000;
 		break;
 
 	case QAM_128: