[media] drxk: Add pre/post BER and PER/UCB stats

The original az6007 driver has the code to calculate such
stats. Add it to the driver, reporting them via DVBv5
stats API.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/dvb-frontends/drxk_hard.h

@@ -345,6 +345,8 @@ struct drxk_state {
 	bool	antenna_dvbt;
 	u16	antenna_gpio;
 
+	fe_status_t fe_status;
+
 	/* Firmware */
 	const char *microcode_name;
 	struct completion fw_wait_load;