MdeModulePkg SmmLockBoxSmmLib: Add DESTRUCTOR SmmLockBoxSmmDestructor

SmmLockBoxSmmLib is linked to SMM modules. If the module entry-point
function returns error, the module will be unloaded and the global
variables will point to undefined memory.

This patch is to add DESTRUCTOR SmmLockBoxSmmDestructor to uninstall
SmmLockBoxCommunication configuration table if it has been installed
in Constructor.

Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Star Zeng <star.zeng@intel.com>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Tested-by: Laszlo Ersek <lersek@redhat.com>