strider: Support con-dp flavor

There is a new strider console flavor with DisplayPort
video.

Signed-off-by: Dirk Eibach <dirk.eibach@gdsys.cc>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/board/gdsys/common/Makefile b/board/gdsys/common/Makefile
index ce23045..d4f0e70 100644
--- a/board/gdsys/common/Makefile
+++ b/board/gdsys/common/Makefile
@@ -16,3 +16,4 @@
 obj-$(CONFIG_STRIDER) += mclink.o dp501.o phy.o ioep-fpga.o adv7611.o ch7301.o
 obj-$(CONFIG_STRIDER) += fanctrl.o
 obj-$(CONFIG_STRIDER_CON) += osd.o
+obj-$(CONFIG_STRIDER_CON_DP) += osd.o