Add phosphor-power to Rainier image build

When Rainier was removed from AC server builds, the phosphor-power
repository was dropped from the image.  Add phosphor-power to Rainer
builds.

Signed-off-by: Jim Wright <jlwright@us.ibm.com>
Change-Id: I791e82a192d1acff1919ece5d49891c5f098db2e
2 files changed