Redfish: Processor: Add new 2019.4 properties

In 2019.4 was a new 1.7.0 Processor schema that included
PartNumber, SerialNumber, and Version.

Tested: Ran validator.
 curl -k  https://${bmc}/redfish/v1/Systems/system/Processors/cpu0
{
  "@odata.context": "/redfish/v1/$metadata#Processor.Processor",
  "@odata.id": "/redfish/v1/Systems/system/Processors/cpu0",
  "@odata.type": "#Processor.v1_7_0.Processor",
  "Id": "cpu0",
  "InstructionSet": "PowerISA",
  "Manufacturer": "IBM",
  "Model": "",
  "Name": "Processor",
  "PartNumber": "02CY102",
  "ProcessorArchitecture": "Power",
  "ProcessorType": "CPU",
  "SerialNumber": "YA1934292547",
  "Status": {
    "Health": "OK",
    "State": "Enabled"
  },
  "TotalCores": 18,
  "Version": "22"
}

Change-Id: I6ad02eacf77640965d126a9db6c51cdfdb691978
Signed-off-by: Gunnar Mills <gmills@us.ibm.com>