Platform/ARM: Map Platform Boot Timeout PCD to global NV variable

Table 13 of UEFI Specification 2.7A describes Timeout global
variable as NV (non-volatile), however

  gEfiMdePkgTokenSpaceGuid.PcdPlatformBootTimeOut

is defined in [PcdsFixedAtBuild.common] section of

  Platform/ARM/VExpressPkg/ArmVExpress.dsc.inc.

This prevents the timeout value from being persistent across
resets and power cycles, see BdsEntry() code in
MdeModulePkg/Universal/BdsDxe/BdsEntry.c:

  //
  // Initialize L"Timeout" EFI global variable.
  //
  BootTimeOut = PcdGet16 (PcdPlatformBootTimeOut);

This patch fixes the above issue by mapping PcdPlatformBootTimeOut
to global NV variable "Timeout" as a PcdsDynamicHii PCD.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Alexei Fedorov <Alexei.Fedorov@arm.com>
Reviewed-by: Evan Lloyd <Evan.Lloyd@arm.com>
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>

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