V4L/DVB (6827): Auto-selects D2633 for ATSC

ATSC standard-specific firmware is D2633 on both v2.5 and v2.7. Better to
auto-select this firmware, overriding ctrl.d2633.
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

drivers/media/video/tuner-xc2028.c

@@ -970,7 +970,10 @@ static int xc2028_set_params(struct dvb_frontend *fe,
 		break;
 	case FE_ATSC:
 		bw = BANDWIDTH_6_MHZ;
+		/* The only ATSC firmware (at least on v2.7) is D2633,
+		   so overrides ctrl->d2633 */
 		type |= ATSC| D2633;
+		type &= ~D2620;
 		break;
 	/* DVB-S is not supported */
 	default: