[code-quality] fix clang-tidy wifi related (#7254)

esphome/components/wifi_signal/wifi_signal_sensor.cpp

@@ -1,4 +1,5 @@
 #include "wifi_signal_sensor.h"
+#ifdef USE_WIFI
 #include "esphome/core/log.h"
 
 namespace esphome {
@@ -10,3 +11,4 @@ void WiFiSignalSensor::dump_config() { LOG_SENSOR("", "WiFi Signal", this); }
 
 }  // namespace wifi_signal
 }  // namespace esphome
+#endif