Fix problem with multiple versions of uboot-mkimage

Change-Id: Ie1974edda0409e3b8665d5fc0930e383d3046b47
diff --git a/bootloader.mk b/bootloader.mk
index 815e1c6..d86fcb0 100644
--- a/bootloader.mk
+++ b/bootloader.mk
@@ -45,7 +45,8 @@
 else
 $(HOST_OUT)/bin/mkimage: fetch-uboot | out-dirs
 endif
-	find $(PRODUCT_OUT)/packages -name 'uboot-mkimage*.deb' | xargs \
+	find $(PRODUCT_OUT)/packages -name 'uboot-mkimage*.deb' | \
+	sort -n | tail -1 | xargs \
 	dpkg --fsys-tarfile | \
 	tar --strip-components 3 -C $(HOST_OUT)/bin -xf - ./usr/bin/mkimage