OvmfPkg: add QemuRamfbDxe

Add a driver for the qemu ramfb display device.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
[lersek@redhat.com: fix INF banner typo]
[lersek@redhat.com: make some local variable definitions more idiomatic]
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Tested-by: Laszlo Ersek <lersek@redhat.com>

OvmfPkg/QemuRamfbDxe/QemuRamfbDxe.inf

@@ -0,0 +1,53 @@
+## @file
+#  This driver is a implementation of the Graphics Output Protocol
+#  for the QEMU ramfb device.
+#
+#  Copyright (c) 2018, Red Hat Inc.
+#
+#  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                      = QemuRamfbDxe
+  FILE_GUID                      = dce1b094-7dc6-45d0-9fdd-d7fc3cc3e4ef
+  MODULE_TYPE                    = DXE_DRIVER
+  VERSION_STRING                 = 1.0
+
+  ENTRY_POINT                    = InitializeQemuRamfb
+
+[Sources]
+  QemuRamfb.c
+
+[Packages]
+  MdePkg/MdePkg.dec
+  MdeModulePkg/MdeModulePkg.dec
+  OvmfPkg/OvmfPkg.dec
+
+[LibraryClasses]
+  BaseLib
+  BaseMemoryLib
+  DebugLib
+  DevicePathLib
+  FrameBufferBltLib
+  MemoryAllocationLib
+  UefiBootServicesTableLib
+  UefiDriverEntryPoint
+  QemuFwCfgLib
+
+[Protocols]
+  gEfiGraphicsOutputProtocolGuid                ## PRODUCES
+
+[Guids]
+  gQemuRamfbGuid
+
+[Depex]
+  TRUE