drm/omap: hdmi: Remove omap_dss_device operations

drm/omap: hdmi: Remove omap_dss_device operations

Now that the HDMI outputs are driven fully through the drm_bridge API
their omap_dss_device operations are not used anymore. Remove them.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Tested-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200226112514.12455-42-laurent.pinchart@ideasonboard.com