tree eedf927bbba5465029f0e59af1ca4531c2a35f05
parent b90cacdd0c1ab8ea7576d4ca9f20aa5828a84e42
author Patrick Venture <venture@google.com> 1561991971 -0700
committer Patrick Venture <venture@google.com> 1562178588 -0700

build: install three targets to handle bmc updates

Transition from three service files to three targets installed by the
BMC library:
 - phosphor-ipmi-flash-bmc-prepare.target
 - phosphor-ipmi-flash-bmc-verify.target
 - phosphor-ipmi-flash-bmc-update.target

The prepare target is started each time the firmware update state
machine changes from notYetStarted to uploadInProgress and can be
leveraged to free memory (flush caches) or anything else required.

The verify target is started when the verify blob is committed.  The
implementation of services within this target are such that they are
expected to output a status value that's readable (typically via a
file).

The update target is started when the update blob is committed.

Signed-off-by: Patrick Venture <venture@google.com>
Change-Id: I1e838de954a3cf8956ff4b72d090e253b832efe7