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/Library/SmmCpuFeaturesLib/SmmCpuFeaturesLibStm.inf

@@ -2,7 +2,7 @@
 #  The CPU specific programming for PiSmmCpuDxeSmm module when STM support
 #  is included.
 #
-#  Copyright (c) 2009 - 2016, Intel Corporation. All rights reserved.<BR>
+#  Copyright (c) 2009 - 2018, Intel Corporation. All rights reserved.<BR>
 #  This program and the accompanying materials
 #  are licensed and made available under the terms and conditions of the BSD License
 #  which accompanies this distribution.  The full text of the license may be found at
@@ -31,8 +31,6 @@
 [Sources.Ia32]
   Ia32/SmmStmSupport.c
 
-  Ia32/SmiEntry.asm
-  Ia32/SmiException.asm
 
   Ia32/SmiEntry.nasm
   Ia32/SmiException.nasm
@@ -43,8 +41,6 @@
 [Sources.X64]
   X64/SmmStmSupport.c
 
-  X64/SmiEntry.asm
-  X64/SmiException.asm
 
   X64/SmiEntry.nasm
   X64/SmiException.nasm