Call SpiNorFlash::WakeUp() during initialization to ensure that the chip is not is sleep mode.

src/SystemTask/SystemTask.cpp

@@ -58,6 +58,7 @@ void SystemTask::Work() {
 
   spi.Init();
   spiNorFlash.Init();
+  spiNorFlash.Wakeup();
   nimbleController.Init();
   nimbleController.StartAdvertising();
   lcd.Init();

src/graphics.cpp

@@ -79,6 +79,7 @@ void Process(void* instance) {
   NRF_LOG_INFO("Init...");
   spi.Init();
   spiNorFlash.Init();
+  spiNorFlash.Wakeup();
   brightnessController.Init();
   lcd.Init();
   gfx.Init();