The IMAGE_ROOTFS_EXTRA_SPACE value was not correctly added to the base
size.
(From OE-Core rev: f3ac2a68ae0ae9bdf2a03c1b6d0f83c9918d58bd)
Signed-off-by: Laurentiu Palcu <laurentiu.palcu@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>