pldmtool: Add GetFirmwareParameters firmware update command

Tested:

pldmtool fw_update GetFwParams -m <eid>
{
    "CapabilitiesDuringUpdate": {
        "Component Update Failure Recovery Capability": "Device will revert to previous component image upon failure, timeout or cancellation of the transfer.",
        "Component Update Failure Retry Capability": " Device can have component updated again without exiting update mode and restarting transfer via RequestUpdate command.",
        "Firmware Device Partial Updates": "Firmware Device cannot accept a partial update and all components present on the FD shall be updated.",
        "Firmware Device Host Functionality during Firmware Update": "Device will revert to previous component image upon failure, timeout or cancellation of the transfer",
        "Firmware Device Update Mode Restrictions": "No host OS environment restriction for update mode"
    },
    "ComponentCount": 2,
    "ActiveComponentImageSetVersionString": "XXXXXXXX",
    "PendingComponentImageSetVersionString": "",
    "ComponentParameterEntries": [
        {
            "ComponentClassification": "Firmware",
            "ComponentIdentifier": 1,
            "ComponentClassificationIndex": 0,
            "ActiveComponentComparisonStamp": 0,
            "ActiveComponentReleaseDate": "",
            "PendingComponentComparisonStamp": 0,
            "PendingComponentReleaseDate": "",
            "ComponentActivationMethods": [
                "System reboot"
            ],
            "CapabilitiesDuringUpdate": {
                "Firmware Device apply state functionality": " Firmware Device will execute an operation during the APPLY state which will include migrating the new component image to its final non-volatile storage destination."
            },
            "ActiveComponentVersionString": "XXXXXXXX",
            "PendingComponentVersionString": ""
        },
        {
            "ComponentClassification": "Firmware",
            "ComponentIdentifier": 2,
            "ComponentClassificationIndex": 0,
            "ActiveComponentComparisonStamp": 0,
            "ActiveComponentReleaseDate": "",
            "PendingComponentComparisonStamp": 0,
            "PendingComponentReleaseDate": "",
            "ComponentActivationMethods": [
                "System reboot"
            ],
            "CapabilitiesDuringUpdate": {
                "Firmware Device apply state functionality": " Firmware Device will execute an operation during the APPLY state which will include migrating the new component image to its final non-volatile storage destination."
            },
            "ActiveComponentVersionString": "XXXXXXXX",
            "PendingComponentVersionString": ""
        }
    ]
}

Signed-off-by: Tom Joseph <rushtotom@gmail.com>
Change-Id: I1370beca144853f3b638a7541a8589282ccf1273