configs/imx6-sabresd_qt5: Select the KMSRO gallium driver
After migrating to Mesa 19.2 the imx-drm_dri.so is no longer installed
unless the kmsro gallium driver is selected, so explicitly select
BR2_PACKAGE_MESA3D_GALLIUM_DRIVER_KMSRO to fix the problem.
Suggested-by: Peter Seiderer <ps.report@gmx.net>
Signed-off-by: Fabio Estevam <festevam@gmail.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>