pldm: Enable oem-ibm flag

The default was recently changed so it stopped installing some header
files that phosphor-logging needs for CI.

Signed-off-by: Matt Spinler <spinler@us.ibm.com>
Change-Id: I41a1e3d899652c52b983801c1ce7fed495811325
diff --git a/build-unit-test-docker.sh b/build-unit-test-docker.sh
index 01c4346..808835a 100755
--- a/build-unit-test-docker.sh
+++ b/build-unit-test-docker.sh
@@ -496,7 +496,7 @@
 COPY --from=openbmc-CLI11 ${PREFIX} ${PREFIX}
 RUN curl -L https://github.com/openbmc/pldm/archive/${PKG_REV['openbmc/pldm']}.tar.gz | tar -xz && \
 cd pldm-* && \
-meson build ${MESON_FLAGS[@]} -Dlibpldm-only=enabled -Dtests=disabled && \
+meson build ${MESON_FLAGS[@]} -Dlibpldm-only=enabled -Doem-ibm=enabled -Dtests=disabled && \
 ninja -C build && \
 ninja -C build install