MdeModulePkg/XhciPei: Support IoMmu.

Update XHCI driver to consume IOMMU_PPI to allocate DMA buffer.

If no IOMMU_PPI exists, this driver still calls PEI service
to allocate DMA buffer, with assumption that DRAM==DMA.

This is a compatible change.

Cc: Star Zeng <star.zeng@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Jiewen Yao <jiewen.yao@intel.com>
Reviewed-by: Star Zeng <star.zeng@intel.com>

MdeModulePkg/Bus/Pci/XhciPei/UsbHcMem.h

@@ -29,6 +29,7 @@ struct _USBHC_MEM_BLOCK {
   UINT8                 *Buf;
   UINT8                 *BufHost;
   UINTN                 BufLen; // Memory size in bytes
+  VOID                  *Mapping;
   USBHC_MEM_BLOCK       *Next;
 };
 
@@ -112,6 +113,7 @@ UsbHcGetHostAddrForPciAddr (
   @param  HostAddress           The system memory address to map to the PCI controller.
   @param  DeviceAddress         The resulting map address for the bus master PCI controller to
                                 use to access the hosts HostAddress.
+  @param  Mapping               A resulting value to pass to Unmap().
 
   @retval EFI_SUCCESS           Success to allocate aligned pages.
   @retval EFI_INVALID_PARAMETER Pages or Alignment is not valid.
@@ -123,7 +125,8 @@ UsbHcAllocateAlignedPages (
   IN UINTN                      Pages,
   IN UINTN                      Alignment,
   OUT VOID                      **HostAddress,
-  OUT EFI_PHYSICAL_ADDRESS      *DeviceAddress
+  OUT EFI_PHYSICAL_ADDRESS      *DeviceAddress,
+  OUT VOID                      **Mapping
   );
 
 /**
@@ -131,12 +134,14 @@ UsbHcAllocateAlignedPages (
 
   @param  HostAddress           The system memory address to map to the PCI controller.
   @param  Pages                 The number of pages to free.
+  @param  Mapping               The mapping value returned from Map().
 
 **/
 VOID
 UsbHcFreeAlignedPages (
   IN VOID               *HostAddress,
-  IN UINTN              Pages
+  IN UINTN              Pages,
+  IN VOID               *Mapping
   );
 
 #endif