code-update: Add interface for MultipartUpdate

This commit adds interface to identify the multi part update
to delegate the code update with the multi part image when no
firmware targets are specifi

code-update: Add interface for MultipartUpdate

This commit adds interface to identify the multi part update
to delegate the code update with the multi part image when no
firmware targets are specified.

The design doc update on how to handle multi part image when
no firmware targets are specified.
https://gerrit.openbmc.org/c/openbmc/docs/+/76645

Change-Id: I34581dedf2cf9c21619c64a7f07e531578cf317c
Signed-off-by: Tom Joseph <rushtotom@gmail.com>

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