oem-ibm: libpldmresponder: file_io_type_vpd: Remove unused vpdFileType

```
In file included from ../oem/ibm/libpldmresponder/file_io_type_vpd.cpp:1:
../oem/ibm/libpldmresponder/file_io_type_vpd.hpp:72:14: error: private field 'vpdFileType' is not used [-Werror,-Wunused-private-field]
   72 |     uint16_t vpdFileType; //!< type of the VPD file
      |              ^
```

Change-Id: If1208f21bcedaff912079371cf2e79df4b17093f
Signed-off-by: Andrew Jeffery <andrew@codeconstruct.com.au>
diff --git a/oem/ibm/libpldmresponder/file_io_type_vpd.hpp b/oem/ibm/libpldmresponder/file_io_type_vpd.hpp
index 8690116..370bb08 100644
--- a/oem/ibm/libpldmresponder/file_io_type_vpd.hpp
+++ b/oem/ibm/libpldmresponder/file_io_type_vpd.hpp
@@ -17,8 +17,8 @@
   public:
     /** @brief Handler constructor
      */
-    keywordHandler(uint32_t fileHandle, uint16_t fileType) :
-        FileHandler(fileHandle), vpdFileType(fileType)
+    keywordHandler(uint32_t fileHandle, uint16_t /* fileType */) :
+        FileHandler(fileHandle)
     {}
     virtual int writeFromMemory(uint32_t /*offset*/, uint32_t /*length*/,
                                 uint64_t /*address*/,
@@ -67,9 +67,6 @@
     /** @brief keywordHandler destructor
      */
     ~keywordHandler() {}
-
-  private:
-    uint16_t vpdFileType; //!< type of the VPD file
 };
 } // namespace responder
 } // namespace pldm