Implement Association interface

Implement xyz/openbmc_project/Association/Definitions.interface in
activation and item_updater.

Tested: Verify the association is created after uploading a dummy

Implement Association interface

Implement xyz/openbmc_project/Association/Definitions.interface in
activation and item_updater.

Tested: Verify the association is created after uploading a dummy
tarball.

Signed-off-by: Lei YU <mine260309@gmail.com>
Change-Id: I217bddc48534a0b3b17359e0f3409f6c7c953f08

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