QemuSbsaPkg: Use LockBoxLib null instance

The QemuPkg LockBoxLib is being removed. Used the null instance here
for libraries (like PerformanceLib) that link against a LockBoxLib
instance.

Signed-off-by: Michael Kubacki <michael.kubacki@microsoft.com>

Platforms/QemuSbsaPkg/QemuSbsaPkg.dsc

@@ -122,6 +122,7 @@
 
   UefiRuntimeLib|MdePkg/Library/UefiRuntimeLib/UefiRuntimeLib.inf
   OrderedCollectionLib|MdePkg/Library/BaseOrderedCollectionRedBlackTreeLib/BaseOrderedCollectionRedBlackTreeLib.inf
+  LockBoxLib|MdeModulePkg/Library/LockBoxNullLib/LockBoxNullLib.inf
 
   #
   # Ramdisk Requirements
@@ -208,7 +209,6 @@
   PlatformSecureLib|SecurityPkg/Library/PlatformSecureLibNull/PlatformSecureLibNull.inf
 
   # Security Libraries
-  LockBoxLib            |QemuPkg/Library/LockBoxLib/LockBoxBaseLib.inf
   PasswordStoreLib      |MsCorePkg/Library/PasswordStoreLibNull/PasswordStoreLibNull.inf
   PasswordPolicyLib     |OemPkg/Library/PasswordPolicyLib/PasswordPolicyLib.inf
   SecureBootKeyStoreLib |MsCorePkg/Library/BaseSecureBootKeyStoreLib/BaseSecureBootKeyStoreLib.inf
@@ -455,7 +455,6 @@
   ReportStatusCodeLib|MdeModulePkg/Library/DxeReportStatusCodeLib/DxeReportStatusCodeLib.inf
   PcdDatabaseLoaderLib|MdeModulePkg/Library/PcdDatabaseLoaderLib/Dxe/PcdDatabaseLoaderLibDxe.inf
   UpdateFacsHardwareSignatureLib|OemPkg/Library/UpdateFacsHardwareSignatureLib/UpdateFacsHardwareSignatureLib.inf
-  LockBoxLib|MdeModulePkg/Library/SmmLockBoxLib/SmmLockBoxDxeLib.inf
   PolicyLib|PolicyServicePkg/Library/DxePolicyLib/DxePolicyLib.inf
 
 !if $(TPM2_ENABLE) == TRUE