submodule:mkimage: Fixed mkimage submodule

The mkimage submodule is used to bundle the U-Boot image with
the firmware for various hardware components (e.g. ram).

.gitmodules

 [submodule ".gitlab-ci"]
 	path = .gitlab-ci
 	url = ../../../yocto/infrastructure/gitlab-ci
+
+[submodule "imx-mkimage"]
+	path = tools/imx-mkimage
+	url = ../imx-mkimage-kuk

imx-mkimage @ 37482577

-Subproject commit 251c1aadd1872639f50e2d351ba6de4c9bf40023
+Subproject commit 3748257787e25fea042c8e05cfe83cb6938a3f34