OvmfPkg/XenAcpiPlatformDxe: remove the QEMU ACPI linker/loader client

The root of the QEMU ACPI linker/loader client in XenAcpiPlatformDxe is
the InstallQemuFwCfgTables() function. This function always fails on Xen,
due to its top-most QemuFwCfgFindFile() call.

Remove the InstallQemuFwCfgTables() function call from XenAcpiPlatformDxe,
along with all dependencies that now become unused.

Cc: Anthony Perard <anthony.perard@citrix.com>
Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Julien Grall <julien@xen.org>
Cc: Philippe Mathieu-Daudé <philmd@redhat.com>
Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=2122
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Message-Id: <20210526201446.12554-14-lersek@redhat.com>
Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>

OvmfPkg/XenAcpiPlatformDxe/XenAcpiPlatformDxe.inf

@@ -24,11 +24,8 @@
 [Sources]
   AcpiPlatform.c
   AcpiPlatform.h
-  BootScript.c
   EntryPoint.c
-  PciDecoding.c
   Qemu.c
-  QemuFwCfgAcpi.c
   Xen.c
 
 [Packages]
@@ -43,10 +40,8 @@
   DebugLib
   DxeServicesTableLib
   MemoryAllocationLib
-  OrderedCollectionLib
   PcdLib
   QemuFwCfgLib
-  QemuFwCfgS3Lib
   UefiBootServicesTableLib
   UefiDriverEntryPoint
   XenPlatformLib
@@ -54,7 +49,6 @@
 [Protocols]
   gEfiAcpiTableProtocolGuid                     # PROTOCOL ALWAYS_CONSUMED
   gEfiFirmwareVolume2ProtocolGuid               # PROTOCOL SOMETIMES_CONSUMED
-  gEfiPciIoProtocolGuid                         # PROTOCOL SOMETIMES_CONSUMED
 
 [Guids]
   gRootBridgesConnectedEventGroupGuid