Fix: Disable SPI3_HOST with ESP32-S2 for SpiManager

SPI3_HOST seems not to work in combination with SpiManager when using an ESP32-S2. Therefor don't register this SPI channel

src/PinMapping.cpp

@@ -199,7 +199,9 @@ bool PinMappingClass::init(const String& deviceMapping)
     // Initialize SpiManager
     SpiManagerInst.register_bus(SPI2_HOST);
 #if SOC_SPI_PERIPH_NUM > 2
+#ifndef CONFIG_IDF_TARGET_ESP32S2
     SpiManagerInst.register_bus(SPI3_HOST);
+#endif
 #endif
 
     File f = LittleFS.open(PINMAPPING_FILENAME, "r", false);