MdeModulePkg: Add RamDiskDxe driver implementation

The RamDiskDxe driver will:
1. Produce the EFI RAM Disk Protocol
2. Install RAM disk device path and block I/O related protocols on the
   RAM disk device handle.
3. Install RAM disk configuration form to HII database

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

MdeModulePkg/Universal/Disk/RamDiskDxe/RamDiskNVData.h

@@ -0,0 +1,43 @@
+/** @file
+  Header file for NV data structure definition.
+
+  Copyright (c) 2016, 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.
+
+**/
+
+#ifndef _RAM_DISK_NVDATA_H_
+#define _RAM_DISK_NVDATA_H_
+
+#include <Guid/HiiPlatformSetupFormset.h>
+#include <Guid/RamDiskHii.h>
+
+#define RAM_DISK_CONFIGURATION_VARSTORE_ID  0x0001
+
+#define MAIN_FORM_ID                        0x1000
+#define MAIN_GOTO_FILE_EXPLORER_ID          0x1001
+#define MAIN_REMOVE_RD_QUESTION_ID          0x1002
+#define MAIN_CHECKBOX_QUESTION_ID_START     0x1003
+#define MAIN_LABEL_LIST_START               0x1004
+#define MAIN_LABEL_LIST_END                 0x1005
+
+#define CREATE_RAW_RAM_DISK_FORM_ID         0x2000
+#define CREATE_RAW_SIZE_QUESTION_ID         0x2001
+#define CREATE_RAW_SUBMIT_QUESTION_ID       0x2002
+#define CREATE_RAW_DISCARD_QUESTION_ID      0x2003
+
+typedef struct {
+  UINT64                          Size;
+  //
+  // CheckBox status for created RAM disks
+  //
+  UINT8                           RamDiskList[0];
+} RAM_DISK_CONFIGURATION;
+
+#endif