[media] cxd2820r: wait demod lock for DVB-C too

Fix yet another bug introduced be recent cxd2820r multi-frontend to
single-frontend change.

Finally, we have at least almost working picture for DVB-C too.
Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/dvb/frontends/cxd2820r_core.c

@@ -492,6 +492,7 @@ static enum dvbfe_search cxd2820r_search(struct dvb_frontend *fe)
 	/* frontend lock wait loop count */
 	switch (priv->delivery_system) {
 	case SYS_DVBT:
+	case SYS_DVBC_ANNEX_A:
 		i = 20;
 		break;
 	case SYS_DVBT2: