Fix build issues for idf 4.2 (Support ESP32-S2) (#1433)

Co-authored-by: Otto winter <otto@otto-winter.com>

esphome/components/logger/logger.cpp

@@ -136,7 +136,11 @@ void Logger::pre_setup() {
         break;
 #ifdef ARDUINO_ARCH_ESP32
       case UART_SELECTION_UART2:
+#if !CONFIG_IDF_TARGET_ESP32S2
+        // FIXME: Validate in config that UART2 can't be set for ESP32-S2 (only has
+        // UART0-UART1)
         this->hw_serial_ = &Serial2;
+#endif
         break;
 #endif
     }