According to SD Host Controller 3.0 spec figure 3-10, we have to wait 1ms before checking DAT[3:0] in voltage switch proc Cc: Hao Wu <hao.a.wu@intel.com> Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Feng Tian <feng.tian@intel.com> Reviewed-by: Hao Wu <hao.a.wu@intel.com>