UefiCpuPkg/CpuDxe: Remove unused codes and files

v5:
  1. Remove unused PcdCpuApStackSize and PcdCpuApInitTimeOutInMicroSeconds.

v4:
  1. Keep GDT table setup to fix IA32 S3 boot issue.

Cc: Michael Kinney <michael.d.kinney@intel.com>
Cc: Feng Tian <feng.tian@intel.com>
Cc: Giri P Mudusuru <giri.p.mudusuru@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jeff Fan <jeff.fan@intel.com>
Reviewed-by: Michael Kinney <michael.d.kinney@intel.com>
Tested-by: Laszlo Ersek <lersek@redhat.com>
Tested-by: Michael Kinney <michael.d.kinney@intel.com>

UefiCpuPkg/CpuDxe/CpuDxe.inf

@@ -46,7 +46,6 @@
   MpInitLib
 
 [Sources]
-  ApStartup.c
   CpuDxe.c
   CpuDxe.h
   CpuGdt.c
@@ -58,15 +57,11 @@
   Ia32/CpuAsm.asm
   Ia32/CpuAsm.nasm
   Ia32/CpuAsm.S
-  Ia32/MpAsm.asm
-  Ia32/MpAsm.nasm
 
 [Sources.X64]
   X64/CpuAsm.asm
   X64/CpuAsm.nasm
   X64/CpuAsm.S
-  X64/MpAsm.asm
-  X64/MpAsm.nasm
 
 [Protocols]
   gEfiCpuArchProtocolGuid                       ## PRODUCES
@@ -82,8 +77,6 @@
 
 [Pcd]
   gUefiCpuPkgTokenSpaceGuid.PcdCpuMaxLogicalProcessorNumber    ## CONSUMES
-  gUefiCpuPkgTokenSpaceGuid.PcdCpuApStackSize                  ## CONSUMES
-  gUefiCpuPkgTokenSpaceGuid.PcdCpuApInitTimeOutInMicroSeconds  ## CONSUMES
 
 [Depex]
   TRUE