Add Backlight and PowerSaveTimer

main/boards/common/board.h

@@ -8,6 +8,7 @@
 #include <string>
 
 #include "led/led.h"
+#include "backlight.h"
 
 void* create_board();
 class AudioCodec;
@@ -34,6 +35,7 @@ public:
     virtual ~Board() = default;
     virtual std::string GetBoardType() = 0;
     virtual std::string GetUuid() { return uuid_; }
+    virtual Backlight* GetBacklight() { return nullptr; }
     virtual Led* GetLed();
     virtual AudioCodec* GetAudioCodec() = 0;
     virtual Display* GetDisplay();