Fix Arduino DUE compilation (#20058)

Marlin/src/HAL/STM32/MarlinSPI.cpp

@@ -20,6 +20,8 @@
  *
  */
 
+#if defined(ARDUINO_ARCH_STM32) && !defined(STM32GENERIC)
+
 #include "MarlinSPI.h"
 
 static void spi_init(spi_t *obj, uint32_t speed, spi_mode_e mode, uint8_t msb, uint32_t dataSize) {
@@ -159,3 +161,5 @@ uint8_t MarlinSPI::dmaSend(const void * transmitBuf, uint16_t length, bool minc)
   HAL_DMA_DeInit(&_dmaTx);
   return 1;
 }
+
+#endif // ARDUINO_ARCH_STM32 && !STM32GENERIC

Marlin/src/feature/controllerfan.cpp

@@ -34,6 +34,8 @@ uint8_t ControllerFan::speed;
 
 #if ENABLED(CONTROLLER_FAN_EDITABLE)
   controllerFan_settings_t ControllerFan::settings; // {0}
+ #else
+   const controllerFan_settings_t &ControllerFan::settings = controllerFan_defaults;
 #endif
 
 void ControllerFan::setup() {

Marlin/src/feature/controllerfan.h

@@ -58,7 +58,7 @@ class ControllerFan {
     #if ENABLED(CONTROLLER_FAN_EDITABLE)
       static controllerFan_settings_t settings;
     #else
-      static const controllerFan_settings_t constexpr &settings = controllerFan_defaults;
+      static const controllerFan_settings_t &settings;
     #endif
     static inline bool state() { return speed > 0; }
     static inline void init() { reset(); }