iwlwifi: use .cfg to enable/disable continuous ucode trace

Instead of checking device type for enable/disable continuous ucode
trace function; put it in .cfg for better control and more
flexibilities.

Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
diff --git a/drivers/net/wireless/iwlwifi/iwl-core.h b/drivers/net/wireless/iwlwifi/iwl-core.h
index 60d26e4..5034dc0 100644
--- a/drivers/net/wireless/iwlwifi/iwl-core.h
+++ b/drivers/net/wireless/iwlwifi/iwl-core.h
@@ -320,6 +320,7 @@
 	bool temperature_kelvin;
 	u32 max_event_log_size;
 	const bool tx_power_by_driver;
+	const bool ucode_tracing;
 	u8 scan_antennas[IEEE80211_NUM_BANDS];
 };