gnome-control-center: Unbreak gnome images

images that now include both shared-mime-info and gnome-control-center We get

Collected errors:
 * check_data_file_clashes: Package gnome-control-center wants to
 * install file
 * /home/kraj/work/angstrom-repo/build/tmp-angstrom_next-eglibc/work/beaglebone-angstrom-linux-gnueabi/systemd-gnome-image/1.0-r0/rootfs/usr/share/mime/generic-icons
        But that file is already provided by package  * shared-mime-info

This brings it back to wheree it was additionally removes the packaging
warnings

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>