pldmtool: fix GetFruRecordTable request fail

1. Use PLDM_GET_FIRSTPART for TransferOperationFlag to fix request
   failed due to CC code 0x81 (INVALID_TRANSFER_OPERATION_FLAG).
2. Move fruFieldValuestring() to else part to avoid IANA print issue.

Tested result:
```
[
    [
        {
            "FRU Record Set Identifier": 1,
            "FRU Record Type": "General(1)",
            "Number of FRU fields": 11,
            "Encoding Type for FRU fields": "ASCII(1)"
        },

        ......

        {
            "FRU Field Type": "Vendor IANA(15)",
            "FRU Field Length": 4,
            "FRU Field Value": "33049"
        }
    ]
]
```

Change-Id: I1a711ee05c49e35cb76c104ab9b11b5b1ac97118
Signed-off-by: Potin Lai <potin.lai@quantatw.com>
diff --git a/pldmtool/pldm_fru_cmd.cpp b/pldmtool/pldm_fru_cmd.cpp
index 14025aa..5d012da 100644
--- a/pldmtool/pldm_fru_cmd.cpp
+++ b/pldmtool/pldm_fru_cmd.cpp
@@ -132,12 +132,15 @@
                         fruFieldValue =
                             fruFieldParserTimestamp(tlv->value, tlv->length);
                     }
+                    else
+                    {
+                        fruFieldValue =
+                            fruFieldValuestring(tlv->value, tlv->length);
+                    }
 
                     frudata["FRU Field Type"] =
                         typeToString(FruFieldTypeMap, tlv->type);
                     frudata["FRU Field Length"] = (int)(tlv->length);
-                    fruFieldValue =
-                        fruFieldValuestring(tlv->value, tlv->length);
                     frudata["FRU Field Value"] = fruFieldValue;
                     frufielddata.emplace_back(frudata);
                 }
@@ -415,7 +418,7 @@
         auto request = reinterpret_cast<pldm_msg*>(requestMsg.data());
 
         auto rc = encode_get_fru_record_table_req(
-            instanceId, 0, PLDM_START_AND_END, request,
+            instanceId, 0, PLDM_GET_FIRSTPART, request,
             requestMsg.size() - sizeof(pldm_msg_hdr));
         return {rc, requestMsg};
     }