MdeModulePkg/SdMmcPciHcDxe: break cmd exec if the card isn't identified

Check if the card is identified/initialized correctly. if not, break
the following cmd execution through PassThru()/ResetDevice().

Cc: Wu, Hao A <hao.a.wu@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Feng Tian <feng.tian@intel.com>

MdeModulePkg/Bus/Pci/SdMmcPciHcDxe/SdMmcPciHcDxe.h

@@ -83,6 +83,7 @@ typedef struct {
   BOOLEAN                           Enable;
   EFI_SD_MMC_SLOT_TYPE              SlotType;
   BOOLEAN                           MediaPresent;
+  BOOLEAN                           Initialized;
   SD_MMC_CARD_TYPE                  CardType;
 } SD_MMC_HC_SLOT;