Add MaxLanes and MaxPCIeType properties to the PCIeInterface

According to the Redfish Data Model specification PCIeInterface (v1.3+)
of the PCIeDevice model contains the following properties:

MaxLanes (v1.3+)
The number of PCIe lanes supported by this device.
- This property shall contain the maximum number of
  PCIe lanes supported by this device.

MaxPCIeType (v1.3+)
The highest version of the PCIe specification supported by
this device.
- This property shall contain the maximum PCIe
  specification that this device supports.

Since PCIeDevice interface from the phosphor-dbus-interfaces has these
values in the 'MaxLanes' and 'GenerationSupported' properties, populate
the fields to Redfish.

Tested: Redfish validator passed

Before:
redfish/v1/Systems/system/PCIeDevices/Bus_c3_Device_00
{
  "@odata.id": "/redfish/v1/Systems/system/PCIeDevices/Bus_c3_Device_00",
  "@odata.type": "#PCIeDevice.v1_9_0.PCIeDevice",
  ...
  "PCIeInterface": {
    "LanesInUse": 4,
    "PCIeType": "Gen3"
  },
  ...
}

After:
redfish/v1/Systems/system/PCIeDevices/Bus_c3_Device_00
{
  "@odata.id": "/redfish/v1/Systems/system/PCIeDevices/Bus_c3_Device_00",
  "@odata.type": "#PCIeDevice.v1_9_0.PCIeDevice",
  ...
  "PCIeInterface": {
    "LanesInUse": 4,
    "MaxLanes": 4,
    "MaxPCIeType": "Gen3",
    "PCIeType": "Gen3"
  },
  ...
}

Change-Id: Iec786e376cea8fd2aa516b5b2a3da4286e59627a
Signed-off-by: Konstantin Aladyshev <aladyshev22@gmail.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/Redfish.md b/Redfish.md
index a7b3445d82..f2fb141916 100644
--- a/Redfish.md
+++ b/Redfish.md
@@ -861,6 +861,8 @@ other.
 - PCIeInterface
   - DeviceType
   - LanesInUse
+  - MaxLanes
+  - MaxPCIeType
   - PCIeType
 - SerialNumber
 - Slot