ArmVirtPkg: don't set PcdCoreCount

According to the

  PCDs not used by modules or in conditional directives

sections of all the build reports for

  {AARCH64,ARM} x
  {Qemu,QemuKernel,Xen} x
  {DEBUG,NOOPT,RELEASE} x
  {feat-0,feat-1}

(36 builds in total), the PCD is not used in any of those builds. Remove
the setting.

("feat-1" stands for "-D HTTP_BOOT_ENABLE -D NETWORK_IP6_ENABLE -D
SECURE_BOOT_ENABLE -D TTY_TERMINAL", while "feat-0" stands for "".)

Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Julien Grall <julien.grall@linaro.org>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>

ArmVirtPkg/ArmVirtQemu.dsc

@@ -87,7 +87,6 @@
   gEfiMdeModulePkgTokenSpaceGuid.PcdConOutUgaSupport|FALSE
 
 [PcdsFixedAtBuild.common]
-  gArmPlatformTokenSpaceGuid.PcdCoreCount|1
 !if $(ARCH) == AARCH64
   gArmTokenSpaceGuid.PcdVFPEnabled|1
 !endif

ArmVirtPkg/ArmVirtQemuKernel.dsc

@@ -93,7 +93,6 @@
   gEfiMdeModulePkgTokenSpaceGuid.PcdConOutUgaSupport|FALSE
 
 [PcdsFixedAtBuild.common]
-  gArmPlatformTokenSpaceGuid.PcdCoreCount|1
 !if $(ARCH) == AARCH64
   gArmTokenSpaceGuid.PcdVFPEnabled|1
 !endif

ArmVirtPkg/ArmVirtXen.dsc

@@ -74,8 +74,6 @@
 
 [PcdsFixedAtBuild.common]
   gEfiMdeModulePkgTokenSpaceGuid.PcdFirmwareVersionString|L"$(FIRMWARE_VER)"
-
-  gArmPlatformTokenSpaceGuid.PcdCoreCount|1
 !if $(ARCH) == AARCH64
   gArmTokenSpaceGuid.PcdVFPEnabled|1
 !endif