Fix mkimage build for jenkins

Change-Id: I7786351841c6700bd01badb51e645d13099eff98
diff --git a/bootloader.mk b/bootloader.mk
index d86fcb0..9146740 100644
--- a/bootloader.mk
+++ b/bootloader.mk
@@ -45,6 +45,7 @@
 else
 $(HOST_OUT)/bin/mkimage: fetch-uboot | out-dirs
 endif
+	mkdir -p $(HOST_OUT)/bin
 	find $(PRODUCT_OUT)/packages -name 'uboot-mkimage*.deb' | \
 	sort -n | tail -1 | xargs \
 	dpkg --fsys-tarfile | \