UefiPayloadPkg: Scan for Option ROMs

Install the gPciPlatformProtocol to scan for Option ROMs.

For every device we probe the Option ROM and provide a pointer
to the activated BAR if found.

It's safe to assume that all ROM bars have been enumerated,
reserved in the bridge resources and are disabled by default.

Enabling them and leaving them enabled will do no harm.

Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>

UefiPayloadPkg/PciPlatformDxe/PciPlatformDxe.inf

@@ -0,0 +1,46 @@
+## @file
+# This driver produces gEfiPciPlatform protocol to load PCI Option ROMs
+#
+# Copyright (c) 2020, 9elements Agency GmbH
+#
+#  SPDX-License-Identifier: BSD-2-Clause-Patent
+#
+#
+##
+
+[Defines]
+  INF_VERSION                    = 0x00010005
+  BASE_NAME                      = PciPlatformDxe
+  FILE_GUID                      = 86D58F7B-6E7C-401F-BDD4-E32E6D582AAD
+  MODULE_TYPE                    = UEFI_DRIVER
+  VERSION_STRING                 = 1.0
+  ENTRY_POINT                    = InstallPciPlatformProtocol
+
+#
+# The following information is for reference only and not required by the build tools.
+#
+#  VALID_ARCHITECTURES           = IA32 X64
+#
+
+[Sources.common]
+  PciPlatformDxe.h
+  PciPlatformDxe.c
+
+[Packages]
+  MdePkg/MdePkg.dec
+  MdeModulePkg/MdeModulePkg.dec
+
+[LibraryClasses]
+  UefiDriverEntryPoint
+  UefiBootServicesTableLib
+  DxeServicesTableLib
+  DebugLib
+  MemoryAllocationLib
+  BaseMemoryLib
+  DevicePathLib
+  UefiLib
+  HobLib
+
+[Protocols]
+  gEfiPciPlatformProtocolGuid                   ## PRODUCES
+  gEfiPciIoProtocolGuid                         ## COMSUMES