ArmVirtPkg: ArmVirtQemuKernel: make ACPI support AARCH64 only

The reasoning of patch 8e2efec6b206:

  No ARM support for ACPI is planned under any OS we intend to run under
  ArmVirtQemu-ARM, so remove the drivers from the ARM build.

applies equally to ArmVirtQemuKernel, so apply the same change there.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>

ArmVirtPkg/ArmVirtQemuKernel.dsc

@@ -339,15 +339,6 @@
   }
   OvmfPkg/SmbiosPlatformDxe/SmbiosPlatformDxe.inf
 
-  #
-  # ACPI Support
-  #
-  MdeModulePkg/Universal/Acpi/AcpiTableDxe/AcpiTableDxe.inf
-  OvmfPkg/AcpiPlatformDxe/QemuFwCfgAcpiPlatformDxe.inf {
-    <LibraryClasses>
-      NULL|ArmVirtPkg/Library/FdtPciPcdProducerLib/FdtPciPcdProducerLib.inf
-  }
-
   #
   # PCI support
   #
@@ -376,3 +367,13 @@
   MdeModulePkg/Bus/Pci/XhciDxe/XhciDxe.inf
   MdeModulePkg/Bus/Usb/UsbBusDxe/UsbBusDxe.inf
   MdeModulePkg/Bus/Usb/UsbKbDxe/UsbKbDxe.inf
+
+[Components.AARCH64]
+  #
+  # ACPI Support
+  #
+  MdeModulePkg/Universal/Acpi/AcpiTableDxe/AcpiTableDxe.inf
+  OvmfPkg/AcpiPlatformDxe/QemuFwCfgAcpiPlatformDxe.inf {
+    <LibraryClasses>
+      NULL|ArmVirtPkg/Library/FdtPciPcdProducerLib/FdtPciPcdProducerLib.inf
+  }

ArmVirtPkg/ArmVirtQemuKernel.fdf

@@ -218,11 +218,13 @@ READ_LOCK_STATUS   = TRUE
   INF MdeModulePkg/Universal/SmbiosDxe/SmbiosDxe.inf
   INF OvmfPkg/SmbiosPlatformDxe/SmbiosPlatformDxe.inf
 
+!if $(ARCH) == AARCH64
   #
   # ACPI Support
   #
   INF MdeModulePkg/Universal/Acpi/AcpiTableDxe/AcpiTableDxe.inf
   INF OvmfPkg/AcpiPlatformDxe/QemuFwCfgAcpiPlatformDxe.inf
+!endif
 
   #
   # PCI support