UefiCpuPkg: Remove X86 ASM and S files

NASM has replaced ASM and S files.
1. Remove ASM from all modules expect for the ones in ResetVector directory.
The ones in ResetVector directory are included by Vtf0.nasmb. They are
also nasm style.
2. Remove S files from the drivers only.
3. https://bugzilla.tianocore.org/show_bug.cgi?id=881
After NASM is updated, S files can be removed from Library.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Liming Gao <liming.gao@intel.com>
Reviewed-by: Eric Dong <eric.dong@intel.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>

UefiCpuPkg/CpuDxe/CpuDxe.inf

@@ -1,7 +1,7 @@
 ## @file
 #  CPU driver installs CPU Architecture Protocol and CPU MP protocol.
 #
-#  Copyright (c) 2008 - 2017, Intel Corporation. All rights reserved.<BR>
+#  Copyright (c) 2008 - 2018, Intel Corporation. All rights reserved.<BR>
 #  Copyright (c) 2017, AMD Incorporated. All rights reserved.<BR>
 #
 #  This program and the accompanying materials
@@ -58,14 +58,10 @@
   CpuPageTable.c
 
 [Sources.IA32]
-  Ia32/CpuAsm.asm
   Ia32/CpuAsm.nasm
-  Ia32/CpuAsm.S
 
 [Sources.X64]
-  X64/CpuAsm.asm
   X64/CpuAsm.nasm
-  X64/CpuAsm.S
 
 [Protocols]
   gEfiCpuArchProtocolGuid                       ## PRODUCES