rpb-desktop-image: install packagegroup-rpb-x11-utils
rpb-desktop-image: install packagegroup-rpb-x11-utils

Install additional x11 utils into rpb-desktop-image.

Signed-off-by: Dmitry Baryshkov <2dcd7ecf02101ef1dca344c0511f3ffb180907c2@linaro.org>

96boards/meta-rpb,96boards/meta-rpb