Android: Move OSD out of the way when menu is open

https://bugs.dolphin-emu.org/issues/12256

Source/Core/VideoCommon/OnScreenDisplay.h

@@ -44,4 +44,7 @@ void AddTypedMessage(MessageType type, std::string message, u32 ms = Duration::S
 // Draw the current messages on the screen. Only call once per frame.
 void DrawMessages();
 void ClearMessages();
+
+void SetObscuredPixelsLeft(int width);
+void SetObscuredPixelsTop(int height);
 }  // namespace OSD