* Switch to all-UBI layout on SPI-NAND
* use fitblk driver instead of uImage.FIT partition parser
* adapt sysupgrade
* bump COMPAT_VERSION
Remove BROKEN mark now that all needed changes are done.
Boards running images generated before this commit will require
full reflash of the bootloader, re-install from SD card is the
easiest way to achieve that.
Signed-off-by: Daniel Golle <daniel@makrotopia.org>
