UefiCpuPkg PiSmmCpuDxeSmm: Use new EfiLocateFirstAcpiTable()

https://bugzilla.tianocore.org/show_bug.cgi?id=967
Request to add a library function for GetAcpiTable() in order
to get ACPI table using signature as input.

After evaluation, we found there are many duplicated code to
find ACPI table by signature in different modules.

This patch updates PiSmmCpuDxeSmm to use new
EfiLocateFirstAcpiTable() and remove the duplicated code.

Cc: Younas khan <pmdyounaskhan786@gmail.com>
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Ruiyu Ni <ruiyu.ni@intel.com>
Cc: Eric Dong <eric.dong@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Star Zeng <star.zeng@intel.com>
Reviewed-by: Eric Dong <eric.dong@intel.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>

UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.inf

@@ -4,7 +4,7 @@
 # This SMM driver performs SMM initialization, deploy SMM Entry Vector,
 # provides CPU specific services in SMM.
 #
-# Copyright (c) 2009 - 2016, Intel Corporation. All rights reserved.<BR>
+# Copyright (c) 2009 - 2018, Intel Corporation. All rights reserved.<BR>
 # Copyright (c) 2017, AMD Incorporated. All rights reserved.<BR>
 #
 # This program and the accompanying materials
@@ -112,8 +112,6 @@
 
 [Guids]
   gEfiAcpiVariableGuid                     ## SOMETIMES_CONSUMES ## HOB # it is used for S3 boot.
-  gEfiAcpi20TableGuid                      ## SOMETIMES_CONSUMES ## SystemTable
-  gEfiAcpi10TableGuid                      ## SOMETIMES_CONSUMES ## SystemTable
   gEdkiiPiSmmMemoryAttributesTableGuid     ## CONSUMES ## SystemTable
   gEfiMemoryAttributesTableGuid            ## CONSUMES ## SystemTable