Remove build and variant changes from Halo retry branch

variants/thinknode_m5/ThinknodeM5Board.cpp

@@ -19,6 +19,14 @@ void ThinknodeM5Board::begin() {
     ESP32Board::begin();
   }
 
+  void ThinknodeM5Board::enterDeepSleep(uint32_t secs, int pin_wake_btn) {
+    esp_deep_sleep_start();
+  }
+
+  void ThinknodeM5Board::powerOff()  {
+    enterDeepSleep(0);
+  }
+
  uint16_t ThinknodeM5Board::getBattMilliVolts() {
     analogReadResolution(12);
     analogSetPinAttenuation(PIN_VBAT_READ, ADC_11db);