UefiPayloadPkg: Fix issues when MULTIPLE_DEBUG_PORT_SUPPORT is true

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=4427

1. Since UART speed is slower than CPU, BIOS need to check the write
   buffer is empty, to avoid overwrite the buffer content.
2. LPSS UART might disable MMIO space for Windows debug usage during
   ExitBootServices event. BIOS need to avoid access the MMIO space
   after ExitBootServices.

Cc: Guo Dong <guo.dong@intel.com>
Cc: Ray Ni <ray.ni@intel.com>
Cc: Sean Rhodes <sean@starlabs.systems>
Cc: James Lu <james.lu@intel.com>
Reviewed-by: Gua Guo <gua.guo@intel.com>
Signed-off-by: PaytonX Hsieh <paytonx.hsieh@intel.com>

UefiPayloadPkg/Library/BaseSerialPortLibHob/DxeBaseSerialPortLibHob.inf

@@ -0,0 +1,41 @@
+## @file
+#  SerialPortLib instance for UART information retrieved from bootloader.
+#
+#  Copyright (c) 2023, Intel Corporation. All rights reserved.<BR>
+#
+#  SPDX-License-Identifier: BSD-2-Clause-Patent
+#
+##
+
+[Defines]
+  INF_VERSION                    = 0x00010005
+  BASE_NAME                      = DxeBaseSerialPortLibHob
+  FILE_GUID                      = c8def0c5-48e7-45b8-8299-485ea2e63b2c
+  MODULE_TYPE                    = DXE_DRIVER
+  VERSION_STRING                 = 1.0
+  LIBRARY_CLASS                  = SerialPortLib|DXE_CORE DXE_DRIVER DXE_RUNTIME_DRIVER DXE_SMM_DRIVER UEFI_APPLICATION UEFI_DRIVER
+  CONSTRUCTOR                    = DxeBaseSerialPortLibHobConstructor
+
+[Packages]
+  MdePkg/MdePkg.dec
+  MdeModulePkg/MdeModulePkg.dec
+
+[LibraryClasses]
+  PcdLib
+  IoLib
+  HobLib
+  TimerLib
+
+[Sources]
+  DxeBaseSerialPortLibHob.c
+  BaseSerialPortLibHob.c
+
+[Pcd]
+  gEfiMdeModulePkgTokenSpaceGuid.PcdSerialLineControl
+  gEfiMdeModulePkgTokenSpaceGuid.PcdSerialFifoControl
+  gEfiMdeModulePkgTokenSpaceGuid.PcdSerialClockRate
+  gEfiMdeModulePkgTokenSpaceGuid.PcdSerialExtendedTxFifoSize
+  gEfiMdeModulePkgTokenSpaceGuid.PcdSerialUseHardwareFlowControl
+
+[Guids]
+  gUniversalPayloadSerialPortInfoGuid