Merge pull request #2868 from shenki/skiboot-host-dtc

skiboot: Fix building device tree with host-dtc
diff --git a/openpower/package/skiboot/skiboot.mk b/openpower/package/skiboot/skiboot.mk
index 5f3e258..708cef7 100644
--- a/openpower/package/skiboot/skiboot.mk
+++ b/openpower/package/skiboot/skiboot.mk
@@ -43,7 +43,7 @@
 		$(MAKE) $(SKIBOOT_MAKE_OPTS) -C $(@D) all
 
 	$(if $(BR2_SKIBOOT_DEVICETREE), \
-		$(MAKE) -C $(@D)/external/devicetree)
+		$(TARGET_CONFIGURE_OPTS) $(MAKE) -C $(@D)/external/devicetree)
 endef
 
 define SKIBOOT_INSTALL_IMAGES_CMDS