test: Add test for partitions

This is technically a library function, but we use MMCs for testing, so
it is easier to do it with DM. At the moment, the only block devices in
sandbox are MMCs (AFAIK) so we just test with those.

Signed-off-by: Sean Anderson <sean.anderson@seco.com>
diff --git a/test/dm/Makefile b/test/dm/Makefile
index 52a8c93..e7cb1ee 100644
--- a/test/dm/Makefile
+++ b/test/dm/Makefile
@@ -61,6 +61,7 @@
 obj-y += of_extra.o
 obj-$(CONFIG_OSD) += osd.o
 obj-$(CONFIG_DM_VIDEO) += panel.o
+obj-$(CONFIG_EFI_PARTITION) += part.o
 obj-$(CONFIG_DM_PCI) += pci.o
 obj-$(CONFIG_P2SB) += p2sb.o
 obj-$(CONFIG_PCI_ENDPOINT) += pci_ep.o