Install LoadedImage protocol for PiSmmCore.

Install LoadedImage protocol for PiSmmCore.

PiSmmCore installs LoadedImage for each SMM driver. However itself is missing.
So we follow DxeCore style, let PiSmmCore installs LoadedImage protocol for itself,
then the SMM image information is complete.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: "Yao, Jiewen" <jiewen.yao@intel.com>
Reviewed-by: "Zeng, Star" <star.zeng@intel.com>
Reviewed-by: "Kinney, Michael D" <michael.d.kinney@intel.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@18945 6f19259b-4bc3-4df7-8a09-765794883524