UefiCpuPkg/MpInitLib: Update references to SEV-SNP header file

Update reference to SevSnpMsr.h as part of a refactor of MSR definitions and
SEV-SNP related defines. Remove family-specific references (filename) as these
defines are common to all modern EPYC Processors.

Signed-off-by: Paul Grimes <paul.grimes@amd.com>

UefiCpuPkg/Library/MpInitLib/DxeMpLib.c

@@ -2,6 +2,7 @@
   MP initialize support functions for DXE phase.
 
   Copyright (c) 2016 - 2024, Intel Corporation. All rights reserved.<BR>
+  Copyright (c) 2024, AMD Inc. All rights reserved.<BR>
   SPDX-License-Identifier: BSD-2-Clause-Patent
 
 **/
@@ -13,7 +14,7 @@
 #include <Library/DebugAgentLib.h>
 #include <Library/DxeServicesTableLib.h>
 #include <Library/CcExitLib.h>
-#include <Register/Amd/Fam17Msr.h>
+#include <Register/Amd/SevSnpMsr.h>
 #include <Register/Amd/Ghcb.h>
 
 #include <Protocol/Timer.h>

UefiCpuPkg/Library/MpInitLib/MpLib.c

@@ -10,7 +10,7 @@
 
 #include "MpLib.h"
 #include <Library/CcExitLib.h>
-#include <Register/Amd/Fam17Msr.h>
+#include <Register/Amd/SevSnpMsr.h>
 #include <Register/Amd/Ghcb.h>
 
 EFI_GUID  mCpuInitMpLibHobGuid = CPU_INIT_MP_LIB_HOB_GUID;

UefiCpuPkg/Library/MpInitLib/MpLib.h

@@ -36,7 +36,7 @@
 #include <Library/CpuPageTableLib.h>
 #include <ConfidentialComputingGuestAttr.h>
 
-#include <Register/Amd/Fam17Msr.h>
+#include <Register/Amd/SevSnpMsr.h>
 #include <Register/Amd/Ghcb.h>
 
 #include <Guid/MicrocodePatchHob.h>

UefiCpuPkg/Library/MpInitLib/X64/AmdSev.c

@@ -11,7 +11,7 @@
 #include "MpLib.h"
 #include <Library/CcExitLib.h>
 #include <Library/AmdSvsmLib.h>
-#include <Register/Amd/Fam17Msr.h>
+#include <Register/Amd/SevSnpMsr.h>
 #include <Register/Amd/Ghcb.h>
 
 #define _IS_ALIGNED(x, y)  (ALIGN_POINTER((x), (y)) == (x))