kmsro: Extend to include imx-dcss
This allows using the dcss display controllers (with the dcss drm modesetting driver) along with the Etnaviv render-only drivers. DCSS is found on i.MX SoCs.
The driver is not mainline yet: https://lore.kernel.org/linux-arm-kernel/1575625964-27102-1-git-send-email-laurentiu.palcu@nxp.com/
Signed-off-by: Guido Günther agx@sigxcpu.org