ArmVirtPkg: PlatformIntelBdsLib: signal ReadyToBoot on direct kernel boot

According to the UEFI spec, EFI_EVENT_GROUP_READY_TO_BOOT "is notified by
the system when the Boot Manager is about to load and execute a boot
option". ArmVirtPkg doesn't do this currently when launching a kernel from
the QEMU command line. OvmfPkg does (see git commit 28a34033ee).

At least two edk2-wide callbacks are worth mentioning:

- OnReadyToBoot() in
  "MdeModulePkg/Universal/Variable/RuntimeDxe/VariableDxe.c" performs
  variable reclaim and (optionally) installs variable usage statistics as
  a vendor config table;

- OnReadyToBoot() in
  "SecurityPkg/Library/DxeImageVerificationLib/DxeImageVerificationLib.c"
  installs the image execution info table if it doesn't exist yet, in
  SecureBoot-enabled builds.

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

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@18513 6f19259b-4bc3-4df7-8a09-765794883524

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