drm/tilcdc: Fix module unloading
Force crtc dpms off before destroying the crtc instead of just checking the dpms state. This fixes warning message and frozen picture after tilcdc module unloading. Signed-off-by: NJyri Sarha <jsarha@ti.com> Acked-by: NTomi Valkeinen <tomi.valkeinen@ti.com>
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