fwbank: Add reading iowrt version from metadata FDT blob feature
For encrypted kernel storage, we're unable to get iowrt version for the other bank. To fix the issue, we add unencrypted metadata containing version in FDT format after the kernel image.
If version cannot be read (probably encrypted storage) we look for FDT, extract it, and get a version from it.
Extra commit to consider (both UBI & MMC)
Edited by Piotr Kubik