swig has been installed on the buildbots a while a ago and
Petr Štetiar got a fix for the pylibfdt error. Use that and re-enable
the builds for mt7620 and mt7621.
Refresh patches while at it.
Signed-off-by: Daniel Golle <daniel@makrotopia.org>
Let U-Boot handle free space in UBI partitions by recognizing the EOF
marker OpenWrt is using as well for that purpose.
Signed-off-by: Daniel Golle <daniel@makrotopia.org>