MdeModulePkg/PciHostBridge: Add IOMMU support.

If IOMMU protocol is installed, PciHostBridge just calls
IOMMU AllocateBuffer/FreeBuffer/Map/Unmap.

PciHostBridge does not set IOMMU access attribute,
because it does not know which device request the DMA.
This work is done by PciBus driver.

Cc: Ruiyu Ni <ruiyu.ni@intel.com>
Cc: Leo Duran <leo.duran@amd.com>
Cc: Brijesh Singh <brijesh.singh@amd.com>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>

Previous patch Tested-by: Brijesh Singh <brijesh.singh@amd.com>
Previous patch Tested-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jiewen Yao <jiewen.yao@intel.com>
Reviewed-by: Ruiyu Ni <ruiyu.ni@intel.com>
Reviewed-by: Leo Duran <leo.duran@amd.com>

(cherry picked from commit c15da8eb35)

MdeModulePkg/Bus/Pci/PciHostBridgeDxe/PciHostBridgeDxe.inf

@@ -41,6 +41,7 @@
   BaseMemoryLib
   BaseLib
   PciSegmentLib
+  UefiLib
   PciHostBridgeLib
 
 [Protocols]
@@ -49,6 +50,7 @@
   gEfiDevicePathProtocolGuid                      ## BY_START
   gEfiPciRootBridgeIoProtocolGuid                 ## BY_START
   gEfiPciHostBridgeResourceAllocationProtocolGuid ## BY_START
+  gEdkiiIoMmuProtocolGuid                         ## SOMETIMES_CONSUMES
 
 [Depex]
   gEfiCpuIo2ProtocolGuid AND