omapdss: omap-panel-data.h: Remove connector_type from atv pdata

The driver only supports composite connection when booted in legacy mode
so the omap_dss_venc_type can be dropped from the pdata.
At the same time the video/omapdss.h include can be removed as it is no
longer needed.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>