SecurityPkg/Library/Tpm2DeviceLibDTpm: fix s/Constructor/CONSTRUCTOR

SecurityPkg/Library/Tpm2DeviceLibDTpm: fix s/Constructor/CONSTRUCTOR

The library constructor is not being called because of the typo,
causing TPM2 detection/initialization to fail.

This fixes OVMF TPM2 regression since commit f15cb995bb38.
https://bugzilla.tianocore.org/show_bug.cgi?id=1075

Cc: Laszlo Ersek <lersek@redhat.com>
Cc: Zhang Chao B <chao.b.zhang@intel.com>
Cc: Long Qin <qin.long@intel.com>
Fixes: f15cb995bb3880b77e15afe6facd3da05e599a17
Contributed-under: TianoCore Contribution Agreement 1.1
Reported-by: Ricardo Araújo <ricardo@lsd.ufcg.edu.br>
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Chao Zhang <chao.b.zhang@intel.com>