jenkins: Fix some typos

Does what it says on the tin. Prior names weren't passed through docker, so they
wouldn't work. Additionally, this wraps the mkimage target as well, since that
is a separate target that should also depend on the fetch.

Change-Id: I24d15b0829e84ebefe0c947ca66f9d2506bb2bee
diff --git a/bootloader.mk b/bootloader.mk
index dba1d1e..3f01535 100644
--- a/bootloader.mk
+++ b/bootloader.mk
@@ -25,10 +25,10 @@
 	$(LOG) u-boot fetch
 	wget -P $(PRODUCT_OUT)/packages \
 		-e robots=off -nv -A deb -r -np -nd \
-		https://mendel-linux.org/apt/$(RELEASE)-bsp-enterprise/pool/main/u/uboot-imx/
+		https://mendel-linux.org/apt/$(RELEASE_NAME)-bsp-enterprise/pool/main/u/uboot-imx/
 	$(LOG) u-boot fetch finished
 
-ifeq ($(IN_JENKINS),)
+ifeq ($(IS_JENKINS),)
 $(PRODUCT_OUT)/u-boot.imx: uboot-imx | out-dirs
 else
 $(PRODUCT_OUT)/u-boot.imx: fetch-uboot | out-dirs
@@ -39,7 +39,11 @@
 	tar --strip-components 2 -C $(PRODUCT_OUT) -xf - ./boot/u-boot.imx
 	$(LOG) u-boot finished
 
+ifeq ($(IS_JENKINS),)
 $(HOST_OUT)/bin/mkimage: uboot-imx | out-dirs
+else
+$(HOST_OUT)/bin/mkimage: fetch-uboot | out-dirs
+endif
 	find $(PRODUCT_OUT)/packages -name 'uboot-mkimage*.deb' | xargs \
 	dpkg --fsys-tarfile | \
 	tar --strip-components 3 -C $(HOST_OUT)/bin -xf - ./usr/bin/mkimage