When deploying an image to a software raid array, it is currently
required that the deployed image assembles the md arrays automatically
so that the rootfs can be mounted. In order to remove this
requirement/limitation on the deployed image we can add rd.md.uuid to
the kernel command line with the raid array's uuid.
Story: 2006648
Task: 36884
Change-Id: I42cb198753ecd84b7eaef6b5aa7c2064535bfe0e
(cherry picked from commit 1975478097)