Vlv2TbltDevicePkg: Remove DxeTcg2PhysicalPresenceLibNull

Vlv2TbltDevicePkg: Remove DxeTcg2PhysicalPresenceLibNull

https://bugzilla.tianocore.org/show_bug.cgi?id=908

The following commit that to use Tcg2 instead of TrEE breaks the
build of Vlv2TbltDevicePkg\Library\DxeTcg2PhysicalPresenceLibNull

https://github.com/tianocore/edk2/commit/9461604e1490f73fdbcc8e957dbe75f75c73b027#diff-c85873f3649e35873a11936ace983807

The correct fix is to remove the DxeTcg2PhysicalPresenceLibNull
library instance and update library mappings in DSC files.

Cc: Jiewen Yao <jiewen.yao@intel.com>
C: David Wei <david.wei@intel.com>
Cc: Mang Guo <mang.guo@intel.com>
Signed-off-by: Michael D Kinney <michael.d.kinney@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>