MdeModulePkg/PciHostBridge: Count the (mm)io overhead when polling

RootBridgeIo.PollMem()/PollIo() originally don't count the IO/MMIO
access overhead when delaying.
The patch changes the implementation to count the access overhead
so that the actually delay equals to user required delay.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Ruiyu Ni <ruiyu.ni@intel.com>
Reviewed-by: Star Zeng <star.zeng@intel.com>
Cc: Chasel Chiu <chasel.chiu@intel.com>

MdeModulePkg/Bus/Pci/PciHostBridgeDxe/PciHostBridgeDxe.inf

@@ -1,7 +1,7 @@
 ## @file
 #   Generic PCI Host Bridge driver.
 #
-#  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
@@ -43,9 +43,9 @@
   PciSegmentLib
   UefiLib
   PciHostBridgeLib
+  TimerLib
 
 [Protocols]
-  gEfiMetronomeArchProtocolGuid                   ## CONSUMES
   gEfiCpuIo2ProtocolGuid                          ## CONSUMES
   gEfiDevicePathProtocolGuid                      ## BY_START
   gEfiPciRootBridgeIoProtocolGuid                 ## BY_START
@@ -54,5 +54,4 @@
 
 [Depex]
   gEfiCpuIo2ProtocolGuid AND
-  gEfiMetronomeArchProtocolGuid AND
   gEfiCpuArchProtocolGuid