pldmtool: Fix confusing attribute name

- The intent behind this commit is to fix the confused attribute
  name. when we run `pldmtool bios getBIOSTable -t
  1(PLDM_BIOS_ATTR_TABLE)`, we can only get the default value and
  index.

- Early naming will make the caller mistakenly think that this is
  the currect value. In fact, we need to run `pldmtool bios
  getBIOSTable -t 2(PLDM_BIOS_ATTR_VAL_TABLE)` to get the currect
  value.

Tested:
- pldmtool bios getBIOSTable -t 1
  Before:
  {
	"AttributeHandle": 19,
	"AttributeNameHandle": "28(pvm_system_power_off_policy)",
	"AttributeType": "BIOSEnumeration",
	"NumberOfPossibleValues": 3,
	"PossibleValueStringHandle[0]": "12(Power Off)",
	"PossibleValueStringHandle[1]": "14(Stay On)",
	"PossibleValueStringHandle[2]": "2(Automatic)",
	"NumberOfDefaultValues": 1,
	"DefaultValueStringHandleIndex[0]": 2,
	"StringHandle": "2(Automatic)"
  }

  After:
  {
	"AttributeHandle": 19,
	"AttributeNameHandle": "28(pvm_system_power_off_policy)",
	"AttributeType": "BIOSEnumeration",
	"NumberOfPossibleValues": 3,
	"PossibleValueStringHandle[0]": "12(Power Off)",
	"PossibleValueStringHandle[1]": "14(Stay On)",
	"PossibleValueStringHandle[2]": "2(Automatic)",
	"NumberOfDefaultValues": 1,
	"DefaultValueStringHandleIndex[0]": 2,
	"DefaultValueStringHandle": "2(Automatic)"
  }

- pldmtool bios getBIOSTable -t 2
  {
    "AttributeHandle": 19,
    "AttributeType": "BIOSEnumeration",
    "NumberOfCurrentValues": 1,
    "CurrentValueStringHandleIndex[0]": "Automatic"
  }

Signed-off-by: George Liu <liuxiwei@inspur.com>
Change-Id: Ib493d80431dad039f264c65cbdcb8bab80ca85f0
diff --git a/pldmtool/pldm_bios_cmd.cpp b/pldmtool/pldm_bios_cmd.cpp
index 72bc715..68fc2d8 100644
--- a/pldmtool/pldm_bios_cmd.cpp
+++ b/pldmtool/pldm_bios_cmd.cpp
@@ -564,8 +564,9 @@
                     {
                         attrdata["DefaultValueStringHandleIndex[" +
                                  std::to_string(i) + "]"] = (int)defIndices[i];
-                        attrdata["StringHandle"] = displayStringHandle(
-                            pvHandls[defIndices[i]], stringTable);
+                        attrdata["DefaultValueStringHandle"] =
+                            displayStringHandle(pvHandls[defIndices[i]],
+                                                stringTable);
                     }
                     break;
                 }