EmmcDevice: fix detection on some models

From stepan:
"This enables eMMC booting when starting edk2
from depthcharge. Previously the driver would
bail out with an error while setting the eMMC
frequency, because depthcharge has already set
up the controller."

Also fixed detection on google/lars w/Core-i5
with upstream coreboot + Tianocore payload

MdeModulePkg/Bus/Pci/SdMmcPciHcDxe/EmmcDevice.c

@@ -695,7 +695,6 @@ EmmcSwitchClockFreq (
   Status = EmmcSendStatus (PassThru, Slot, Rca, &DevStatus);
   if (EFI_ERROR (Status)) {
     DEBUG ((DEBUG_ERROR, "EmmcSwitchClockFreq: Send status fails with %r\n", Status));
-    return Status;
   }
   //
   // Check the switch operation is really successful or not.
@@ -1166,7 +1165,10 @@ EmmcIdentification (
   Private->Slot[Slot].CardType = EmmcCardType;
 
   Status = EmmcSetBusMode (PciIo, PassThru, Slot, Rca);
-
-  return Status;
+  if (EFI_ERROR (Status)) {
+    DEBUG ((DEBUG_ERROR, "EmmcSetBusMode: fails with %r\n", Status));
+  }
+ 
+  return EFI_SUCCESS;
 }