Added getIRQGpio to return DIO0 for Lilygo T3S3 SX1276

variants/lilygo_t3s3_sx1276/LilygoT3S3SX1276Board.h

@@ -0,0 +1,10 @@
+#pragma once
+
+#include <helpers/ESP32Board.h>
+
+class LilygoT3S3SX1276Board : public ESP32Board {
+public:
+  uint32_t getIRQGpio() override {
+    return P_LORA_DIO_0; // default for SX1276
+  }
+};