tpm2-util: add missing entry in string table

Follow-up for: e5a2e78665

src/shared/tpm2-util.c

@@ -6425,6 +6425,7 @@ static const char* tpm2_userspace_event_type_table[_TPM2_USERSPACE_EVENT_TYPE_MA
         [TPM2_EVENT_VOLUME_KEY] = "volume-key",
         [TPM2_EVENT_MACHINE_ID] = "machine-id",
         [TPM2_EVENT_PRODUCT_ID] = "product-id",
+        [TPM2_EVENT_KEYSLOT]    = "keyslot",
 };
 
 DEFINE_STRING_TABLE_LOOKUP(tpm2_userspace_event_type, Tpm2UserspaceEventType);