SecurityPkg: add TIS sanity check (tpm12)

The code blindly assumes a TIS interface is present in case both CRB and
FIFO checks fail.  Check the InterfaceType for TIS instead and only
return PtpInterfaceTis in case it matches, PtpInterfaceMax otherwise.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>

SecurityPkg/Library/Tpm12DeviceLibDTpm/Tpm12Tis.c

@@ -91,9 +91,13 @@ Tpm12GetPtpInterface (
     return PtpInterfaceFifo;
   }
 
+  if (InterfaceId.Bits.InterfaceType == PTP_INTERFACE_IDENTIFIER_INTERFACE_TYPE_TIS) {
     return PtpInterfaceTis;
   }
 
+  return PtpInterfaceMax;
+}
+
 /**
   Check whether the value of a TPM chip register satisfies the input BIT setting.