IntelSiliconPkg/PlatformVTdInfoSamplePei: Install Null Root Entry Table

BIOS uses TE with a null root entry table to block VT-d engine access
to block any DMA traffic in pre-memory phase.

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=2867



Change-Id: I6c086c1f26e60f781de79cc37677cc5717c5edec
Cc: Ray Ni <ray.ni@intel.com>
Cc: Rangasai V Chaganty <rangasai.v.chaganty@intel.com>
Signed-off-by: Sheng Wei <w.sheng@intel.com>
Reviewed-by: Ray Ni <ray.ni@intel.com>
Reviewed-by: Jenny Huang <jenny.huang@intel.com>
Reviewed-by: Jiewen Yao <Jiewen.yao@intel.com>