[media] siano: don't request statistics too fast

As each DVBv3 call may generate an stats overhead, prevent doing
it too fast. This is specially useful if a burst of get stats
DVBv3 call is sent.

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

drivers/media/common/siano/smsdvb.h

@@ -52,6 +52,8 @@ struct smsdvb_client_t {
 	int event_fe_state;
 	int event_unc_state;
 
+	unsigned long		get_stats_jiffies;
+
 	/* Stats debugfs data */
 	struct dentry		*debugfs;