OMAPDSS: remove enum omap_dss_overlay_managers

We have two almost the same enums: omap_channel and
omap_dss_overlay_managers. omap_channel is used almost everywhere, and
omap_channel assigns explicit values to the enum values which are needed
for proper operation.

omap_dss_overlay_managers is only used in one place, so it's easy to
remove it, which is what this patch does.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

include/video/omapdss.h

@@ -167,13 +167,6 @@ enum omap_dss_audio_state {
 	OMAP_DSS_AUDIO_PLAYING,
 };
 
-/* XXX perhaps this should be removed */
-enum omap_dss_overlay_managers {
-	OMAP_DSS_OVL_MGR_LCD,
-	OMAP_DSS_OVL_MGR_TV,
-	OMAP_DSS_OVL_MGR_LCD2,
-};
-
 enum omap_dss_rotation_type {
 	OMAP_DSS_ROT_DMA	= 1 << 0,
 	OMAP_DSS_ROT_VRFB	= 1 << 1,