OvmfPkg/XenAcpiPlatformDxe: remove delayed ACPI table installation

Because "PcdPciDisableBusEnumeration" is always TRUE in the OvmfXen
platform, we can remove the delayed ACPI table installation from
XenAcpiPlatformDxe. A number of dependencies become useless this way;
remove them too.

(Note that, conversely, in the QemuFwCfgAcpiPlatformDxe driver, we
*cannot* assume that "PcdPciDisableBusEnumeration" is always FALSE,
regardless of Xen: in the ArmVirtQemu platform, the PCD may carry either
FALSE or TRUE, dependent on whether or not the QEMU "virt" machine
configuration includes a PCIe host controller, respectively.)

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: <20210526201446.12554-21-lersek@redhat.com>
Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>

OvmfPkg/XenAcpiPlatformDxe/XenAcpiPlatformDxe.inf

@@ -28,14 +28,12 @@
   Xen.c
 
 [Packages]
-  MdeModulePkg/MdeModulePkg.dec
   MdePkg/MdePkg.dec
   OvmfPkg/OvmfPkg.dec
 
 [LibraryClasses]
   BaseLib
   DebugLib
-  PcdLib
   UefiBootServicesTableLib
   UefiDriverEntryPoint
   XenPlatformLib
@@ -43,11 +41,5 @@
 [Protocols]
   gEfiAcpiTableProtocolGuid                     # PROTOCOL ALWAYS_CONSUMED
 
-[Guids]
-  gRootBridgesConnectedEventGroupGuid
-
-[Pcd]
-  gEfiMdeModulePkgTokenSpaceGuid.PcdPciDisableBusEnumeration
-
 [Depex]
   gEfiAcpiTableProtocolGuid