[media] rtl2832: wrap DVBv5 CNR to DVBv3 SNR

Change legacy DVBv3 read SNR to return values calculated by DVBv5
statistics.

Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
diff --git a/drivers/media/dvb-frontends/rtl2832_priv.h b/drivers/media/dvb-frontends/rtl2832_priv.h
index a5f5ccd..5e90cd4 100644
--- a/drivers/media/dvb-frontends/rtl2832_priv.h
+++ b/drivers/media/dvb-frontends/rtl2832_priv.h
@@ -25,6 +25,7 @@
 #include "rtl2832.h"
 #include <linux/i2c-mux.h>
 #include <linux/regmap.h>
+#include <linux/math64.h>
 
 struct rtl2832_dev {
 	struct rtl2832_platform_data *pdata;