MdeModulePkg: SmmLockBoxSmmLib: Support StandaloneMm for SmmLockBoxLib

This change added support of StandaloneMm for SmmLockBoxLib. It replaces
gSmst with gMmst to support both traditional MM and standalone MM. The
contructor and desctructor functions are abstracted to support different
function prototype definitions.

Cc: Jian J Wang <jian.j.wang@intel.com>
Cc: Hao A Wu <hao.a.wu@intel.com>
Cc: Eric Dong <eric.dong@intel.com>

Signed-off-by: Kun Qin <kun.q@outlook.com>
Reviewed-by: Hao A Wu <hao.a.wu@intel.com>

MdeModulePkg/Library/SmmLockBoxLib/SmmLockBoxLibPrivate.h

@@ -43,5 +43,30 @@ typedef struct {
 
 #pragma pack()
 
+/**
+  Constructor for SmmLockBox library.
+  This is used to set SmmLockBox context, which will be used in PEI phase in S3 boot path later.
+
+  @retval EFI_SUCEESS
+  @return Others          Some error occurs.
+**/
+EFI_STATUS
+SmmLockBoxMmConstructor (
+  VOID
+  );
+
+/**
+  Destructor for SmmLockBox library.
+  This is used to uninstall SmmLockBoxCommunication configuration table
+  if it has been installed in Constructor.
+
+  @retval EFI_SUCEESS       The destructor always returns EFI_SUCCESS.
+
+**/
+EFI_STATUS
+SmmLockBoxMmDestructor (
+  VOID
+  );
+
 #endif