UefiCpuPkg: PiSmmCpuDxeSmm: Remove unused references to SmmLib

The PiSmmCpuDxeSmm module does not use any services from the SmmLib.
This change removes the SmmLib from PiSmmCpuDxeSmm module and also
removes the lib mapping in the UefiCpuPkg DSC file because no other
modules in the UefiCpuPkg use the SmmLib.

Removal of SmmLib is now possible because the only API call to it,
ClearSmi(), was ultimately removed from PiSmmCpuDxeSmm -- see the
"BUGBUG" comment in git commit 529a5a86.

Cc: "Yao, Jiewen" <jiewen.yao@intel.com>
Cc: Jeff Fan <jeff.fan@intel.com>

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Michael Kinney <michael.d.kinney@intel.com>
Reviewed-by: "Yao, Jiewen" <jiewen.yao@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@18673 6f19259b-4bc3-4df7-8a09-765794883524

UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.h

@@ -30,7 +30,6 @@ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
 #include <Library/BaseLib.h>
 #include <Library/IoLib.h>
 #include <Library/TimerLib.h>
-#include <Library/SmmLib.h>
 #include <Library/SynchronizationLib.h>
 #include <Library/DebugLib.h>
 #include <Library/BaseMemoryLib.h>

UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.inf

@@ -101,7 +101,6 @@
   SynchronizationLib
   BaseMemoryLib
   MtrrLib
-  SmmLib
   IoLib
   TimerLib
   SmmServicesTableLib

UefiCpuPkg/UefiCpuPkg.dsc

@@ -55,7 +55,6 @@
   SynchronizationLib|MdePkg/Library/BaseSynchronizationLib/BaseSynchronizationLib.inf
   SmmMemLib|MdePkg/Library/SmmMemLib/SmmMemLib.inf
   CacheMaintenanceLib|MdePkg/Library/BaseCacheMaintenanceLib/BaseCacheMaintenanceLib.inf
-  SmmLib|MdePkg/Library/SmmLibNull/SmmLibNull.inf
   PciLib|MdePkg/Library/BasePciLibPciExpress/BasePciLibPciExpress.inf
   PciExpressLib|MdePkg/Library/BasePciExpressLib/BasePciExpressLib.inf
   SmmCpuPlatformHookLib|UefiCpuPkg/Library/SmmCpuPlatformHookLibNull/SmmCpuPlatformHookLibNull.inf