fw-update: Implement DeviceUpdater

The DeviceUpdater class implements the firmware update of a FD. The
firmware update flow is implemented as per DSP0267_1.0.0 and
DSP0267_1.0.1. All

fw-update: Implement DeviceUpdater

The DeviceUpdater class implements the firmware update of a FD. The
firmware update flow is implemented as per DSP0267_1.0.0 and
DSP0267_1.0.1. All the components applicable for the FD is updated.
This patch doesn't handle error response codes and the further actions
to the firmware update flow. The optional features of package like package
data and device metadata is not included in this patch. Timeouts and retries
of firmware update commands is not included in this patch.

Tested: Added unit tests for the firmware update commands where PLDM
UA is the responder like RequestFirmwareData, TransferComplete,
VerifyComplete and ApplyComplete.

Signed-off-by: Tom Joseph <rushtotom@gmail.com>
Change-Id: If686ca005230d6debc0a6fd2ee73184bd3c28ee1

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