iwlagn: testmode fixed rate available for testmode only

Move tm_fixed_rate inside CONFIG_IWLWIFI_DEVICE_SVTOOL and only
available when the option is enable.

Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
diff --git a/drivers/net/wireless/iwlwifi/iwl-dev.h b/drivers/net/wireless/iwlwifi/iwl-dev.h
index 964be57..72ef50e 100644
--- a/drivers/net/wireless/iwlwifi/iwl-dev.h
+++ b/drivers/net/wireless/iwlwifi/iwl-dev.h
@@ -1535,8 +1535,8 @@
 	bool led_registered;
 #ifdef CONFIG_IWLWIFI_DEVICE_SVTOOL
 	struct iwl_testmode_trace testmode_trace;
-#endif
 	u32 tm_fixed_rate;
+#endif
 
 }; /*iwl_priv */