MdeModulePkg/Xhci: Fix TRT when data length is 0
    
    REF: https://bugzilla.tianocore.org/show_bug.cgi?id=3418
    
    According to xhci spec, at USB packet level, a Control Transfer
    consists of multiple transactions partitioned into stages: a
    setup stage, an optional data stage, and a terminating status
    stage. If Data Stage does not exist, the Transfer Type flag(TRT)
    should be No Data Stage.
    So if data length equals to 0, TRT is set to 0.
    
    Cc: Jian J Wang <jian.j.wang@intel.com>
    Cc: Hao A Wu <hao.a.wu@intel.com>
    Cc: Ray Ni <ray.ni@intel.com>
    Signed-off-by: Wenyi Xie <xiewenyi2@huawei.com>
    Reviewed-by: Hao A Wu <hao.a.wu@intel.com>