ArmVirtPkg/ArmVirtQemu: limit the (I)PA space to 40 bits

ArmVirtPkg/ArmVirtQemu: limit the (I)PA space to 40 bits

KVM uses a fixed size of 40 bits for its intermediate physical address
space, so there is no need to support anything beyond that even if the
host hardware does.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Tested-by: Wei Huang <wei@redhat.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@18928 6f19259b-4bc3-4df7-8a09-765794883524