[media] s921: Properly report the delivery system

Before this patch, a query for the delivery systems were
returned SYS_UNDEFINED.
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/dvb/dvb-core/dvb_frontend.c

@@ -1309,7 +1309,6 @@ static void dtv_set_default_delivery_caps(const struct dvb_frontend *fe, struct
 		p->u.buffer.len = ncaps;
 		return;
 	}
-
 	switch (info->type) {
 	case FE_QPSK:
 		p->u.buffer.data[ncaps++] = SYS_DVBS;

drivers/media/dvb/frontends/s921.c

@@ -440,6 +440,7 @@ static int s921_get_frontend(struct dvb_frontend *fe,
 
 	/* FIXME: Probably it is possible to get it from regs f1 and f2 */
 	p->frequency = state->currentfreq;
+	p->delivery_system = SYS_ISDBT;
 
 	return 0;
 }