configs/imx6-sabresd_qt5: Move from mdev to eudev

configs/imx6-sabresd_qt5: Move from mdev to eudev

Since commit cf66a67112cd706d2e7 ("package/glmark2: drm support needs udev")
udev is needed when the drm flavor is used.

Move from mdev to eudev in order to fix the following glmark2
build failure:

Unknown flavor: . Supported flavors are dispmanx-glesv2, drm-gl,
drm-glesv2, mir-gl, mir-glesv2, wayland-gl, wayland-glesv2, win32-gl,
win32-glesv2, x11-gl, x11-glesv2

Suggested-by: Peter Seiderer <ps.report@gmx.net>
Signed-off-by: Fabio Estevam <festevam@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>