When no DRM device is specified when launching the drm-lease-manager, all devices are searched until a device with the DRIVER_MODESET flag is found.  On the R-Car platform, the PowerVR DRM device has this flag set, but does not expose any DRM resources for modesetting.  A check can be added to the drm-lease-manager to keep searching for devices until it finds one with both the modesetting flag and leaseable resources.