qcacmn: iot_sim code cleanup in wmi

Refactor code and put iot_sim code under feature flag.

Change-Id: Id4720d63ae174d9f4490285e6eb69ab2972ccd28
CRs-Fixed: 2707122

wmi/inc/wmi_unified_priv.h

@@ -1205,8 +1205,10 @@ QDF_STATUS (*send_smart_ant_set_node_config_cmd)(wmi_unified_t wmi_handle,
 		struct smart_ant_node_config_params *param);
 #endif
 
+#ifdef WLAN_IOT_SIM_SUPPORT
 QDF_STATUS (*send_simulation_test_cmd)(wmi_unified_t wmi_handle,
 				       struct simulation_test_params *param);
+#endif
 
 QDF_STATUS (*send_smart_ant_enable_tx_feedback_cmd)(wmi_unified_t wmi_handle,
 		struct smart_ant_enable_tx_feedback_params *param);