ArmVirtualizationPkg: PlatformIntelBdsLib: get front page timeout from QEMU
    
    Put QemuBootOrderLib's GetFrontPageTimeoutFromQemu() to use, so that
    ArmVirtualizationPkg's Platform BDS policy can consume QEMU's command line
    option
    
        -boot menu=on,splash-time=N
    
    RHBZ: https://bugzilla.redhat.com/show_bug.cgi?id=1172756
    
    Contributed-under: TianoCore Contribution Agreement 1.0
    Signed-off-by: Laszlo Ersek <lersek@redhat.com>
    Reviewed-by: Olivier Martin <Olivier.martin@arm.com>