Like Pi Camera app, see discussion in this Mender Hub thread.

Currently we have:

• Few symbolic links.

• Modifications in service files.

To fix the reported problem in Mender Hub, we can extend the "few symbolinc links" above with a more brute approach: to create symbolic links to all files in VFAT partition (mounted in /uboot) from rootfs partition's /boot directory.

Acceptance criteria:

• mender-convert creates symlinks to all files in /uboot

• Verified on Raspberry Pi 3 and 4.