Copy openpower dbus yaml for phosphor-logging

phosphor-logging needs to know about the errors defined
in the openpower-dbus-interfaces yaml.

Change-Id: I6228a3624f18bd9ea12606727daed3a654c9d4b1
Signed-off-by: Matt Spinler <spinler@us.ibm.com>
diff --git a/build-unit-test-docker.sh b/build-unit-test-docker.sh
index 03ea535..6515d2e 100755
--- a/build-unit-test-docker.sh
+++ b/build-unit-test-docker.sh
@@ -297,6 +297,7 @@
 COPY --from=openbmc-cereal ${PREFIX} ${PREFIX}
 COPY --from=openbmc-sdbusplus ${PREFIX} ${PREFIX}
 COPY --from=openbmc-phosphor-dbus-interfaces ${PREFIX} ${PREFIX}
+COPY --from=openbmc-openpower-dbus-interfaces ${PREFIX} ${PREFIX}
 RUN curl -L https://github.com/openbmc/phosphor-logging/archive/${PKG_REV['phosphor-logging']}.tar.gz | tar -xz && \
 cd phosphor-logging-* && \
 ./bootstrap.sh && \