Comment 7 for bug 1900693

So I think the plan of action here should be:
 - Backport the corresponding patch to focal and bionic
 - Respin pi gadgets to pull in the latest uboot
 - Refresh UC18 pi images to get the latest changes, so that no new users would experience this bug
 - Due to the unfeasability of other options, look into creating a repair assertion for existing users

Thank you Zygmunt for your thorough investigation!