Added an item for the custom images.
Added a separator in the combo box.
[YOCTO #4193]
(Bitbake rev: 1eed84c11269c25c13bb444871d84c5dfeabcb73)
Signed-off-by: Cristiana Voicu <cristiana.voicu@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>