ArmPlatformPkg/ArmVExpressPkg: Added the empty 'ArmFvpDxe' platform UEFI driver

ArmPlatformPkg/ArmVExpressPkg: Added the empty 'ArmFvpDxe' platform UEFI driver

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Olivier Martin <olivier.martin@arm.com>
v5:
- For uniformity, add the empty driver to
  ArmVExpress-RTSM-AEMv8Ax4-foundation.* too in this patch, not just
  ArmVExpress-RTSM-AEMv8Ax4.*. V4 added the empty driver to
  ArmVExpress-RTSM-AEMv8Ax4-foundation.* not sooner than the next patch,
  fusing it with other (= virtio) functionality. Let's split these changes
  cleanly.

Change-Id: I7d635011c8d3ac59097c728b7c7786d8677c80cb
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-By: Olivier Martin <olivier.martin@arm.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@14980 6f19259b-4bc3-4df7-8a09-765794883524