Move most of the code from the constructor of the objects statically initialized in main() into Start()/Init() functions to avoid Static Initialization Order Fiasco (https://en.cppreference.com/w/cpp/language/siof). See https://github.com/JF002/InfiniTime/pull/415#issuecomment-859004238.

src/drivers/SpiMaster.cpp

@@ -7,11 +7,14 @@
 using namespace Pinetime::Drivers;
 
 SpiMaster::SpiMaster(const SpiMaster::SpiModule spi, const SpiMaster::Parameters& params) : spi {spi}, params {params} {
-  mutex = xSemaphoreCreateBinary();
-  ASSERT(mutex != NULL);
 }
 
 bool SpiMaster::Init() {
+  if(mutex == nullptr) {
+    mutex = xSemaphoreCreateBinary();
+    ASSERT(mutex != nullptr);
+  }
+
   /* Configure GPIO pins used for pselsck, pselmosi, pselmiso and pselss for SPI0 */
   nrf_gpio_pin_set(params.pinSCK);
   nrf_gpio_cfg_output(params.pinSCK);