Move "Create your own image" item to the bottom of base image list.
Besides, remove an un-used hob list entry.
This fixes [YOCTO #2104]
(From Poky rev: f215ce518ad644ca4747ae17279db4b82d0c715d)
(Bitbake rev: 7e00723a6508023ffbefed2c2de1bc9c55564faa)
Signed-off-by: Dongxiao Xu <dongxiao.xu@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>