[media] cx24120: Enable DVBv5 signal strength stats

Previous patch added in collection, this patch enables them by
signalling they are available.
Signed-off-by: Jemma Denson <jdenson@gmail.com>
Signed-off-by: Patrick Boettcher <patrick.boettcher@posteo.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

drivers/media/dvb-frontends/cx24120.c

@@ -1176,6 +1176,7 @@ static int cx24120_set_vco(struct cx24120_state *state)
 int cx24120_init(struct dvb_frontend *fe)
 {
 	const struct firmware *fw;
+	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 	struct cx24120_state *state = fe->demodulator_priv;
 	struct cx24120_cmd cmd;
 	u8 ret, ret_EA, reg1;
@@ -1361,6 +1362,10 @@ int cx24120_init(struct dvb_frontend *fe)
 	}
 	info("FW version %i.%i.%i.%i\n", vers[0], vers[1], vers[2], vers[3]);
 
+	/* init stats here in order signal app which stats are supported */
+	c->strength.len = 1;
+	c->strength.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
+
 	state->cold_init = 1;
 	return 0;
 }