OvmfPkg: QemuVideoDxe: add further BOCHS modes
    
    This brings the list of BOCHS video modes to par with the QEMU QXL
    implementation.
    
    Contributed-under: TianoCore Contribution Agreement 1.0
    Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>
    Signed-off-by: Laszlo Ersek <lersek@redhat.com>