qcacmn: Rate limit invalid channel number messages

Channel number can be valid when finding out the enumeration for the
channel. Rate limit the messages for the same.

Change-Id: Id8755cffa9030054698f9e5e65c7c30c3155ad1e
CRs-Fixed: 2359311

umac/regulatory/core/src/reg_services.c

@@ -863,7 +863,7 @@ enum channel_enum reg_get_chan_enum(uint32_t chan_num)
 		if (channel_map[count].chan_num == chan_num)
 			return count;
 
-	reg_err("invalid channel number %d", chan_num);
+	reg_debug_rl("invalid channel %d", chan_num);
 
 	return INVALID_CHANNEL;
 }