Move PlatformVTdSampleDxe to Feature/VTd/PlatformVTdSampleDxe. Suggested-by: Star Zeng <star.zeng@intel.com> Cc: Star Zeng <star.zeng@intel.com> Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Jiewen Yao <jiewen.yao@intel.com> Reviewed-by: Star Zeng <star.zeng@intel.com>