MdeModulePkg/SdMmc: Add EDKII SD/MMC stack

This stack includes:
1. Dxe phase support by:
   1) SdMmcPciHcDxe driver to consume PciIo and produce
      SdMmcPassThru.
   2) SdDxe driver to consume SdMmcPassThru to produce
      BlkIo1/BlkIo2.
   3) EmmcDxe driver to consume SdMmcPassThru to produce
      BlkIo1/BlkIo2/SSP.

2. Pei phase support
   1) SdBlockIoPei driver to consume SdMmcHostController
      Ppi and produce VirutalBlkIo1&2.
   2) EmmcBlockIoPei driver to consume SdMmcHostController
      Ppi and produce VirutalBlkIo1&2.
   3) SdMmcPciHcPei driver to produce SdMmcHostController
      Ppi.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Feng Tian <feng.tian@intel.com>
Reviewed-by: Hao Wu <hao.a.wu@intel.com>

MdeModulePkg/Bus/Sd/SdDxe/SdDxe.inf

@@ -0,0 +1,65 @@
+## @file
+#  SdDxe driver is used to manage the SD memory card device.
+#
+#  It produces BlockIo and BlockIo2 protocols to allow upper layer
+#  access the SD memory card device.
+#
+#  Copyright (c) 2015, 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
+#  which accompanies this distribution. The full text of the license may be found at
+#  http://opensource.org/licenses/bsd-license.php
+#  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+#
+#
+##
+
+[Defines]
+  INF_VERSION                    = 0x00010005
+  BASE_NAME                      = SdDxe
+  MODULE_UNI_FILE                = SdDxe.uni
+  FILE_GUID                      = 430AC2F7-EEC6-4093-94F7-9F825A7C1C40
+  MODULE_TYPE                    = UEFI_DRIVER
+  VERSION_STRING                 = 1.0
+  ENTRY_POINT                    = InitializeSdDxe
+
+#
+# The following information is for reference only and not required by the build tools.
+#
+#  VALID_ARCHITECTURES           = IA32 X64 IPF EBC
+#
+#  DRIVER_BINDING                =  gSdDxeDriverBinding
+#  COMPONENT_NAME                =  gSdDxeComponentName
+#  COMPONENT_NAME2               =  gSdDxeComponentName2
+#
+
+[Sources.common]
+  ComponentName.c
+  SdDxe.c
+  SdDxe.h
+  SdBlockIo.c
+  SdBlockIo.h
+
+[Packages]
+  MdePkg/MdePkg.dec
+
+[LibraryClasses]
+  DevicePathLib
+  UefiBootServicesTableLib
+  MemoryAllocationLib
+  BaseMemoryLib
+  UefiLib
+  BaseLib
+  UefiDriverEntryPoint
+  DebugLib
+
+[Protocols]
+  gEfiSdMmcPassThruProtocolGuid                ## TO_START
+  gEfiBlockIoProtocolGuid                      ## BY_START
+  gEfiBlockIo2ProtocolGuid                     ## BY_START
+  ## TO_START
+  ## BY_START
+  gEfiDevicePathProtocolGuid
+