build-image.sh: Exclude kernel from updating

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
build-image.sh: A10/Allwinner -> sunxi

As preparation for supporting other sunxi socs then A10.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
ChangeLog: Add a ChangeLog

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
build-boot-root.sh: Update tags

Signed-off-by: Hans de Goede <hdegoede@redhat.com>