drm/omap: remove fbdev debug enter/leave hooks

This will result in badness for drivers that do not implement
mode_set_base_atomic().  So don't pretend like we can support this.
Signed-off-by: Rob Clark <robdclark@gmail.com>

drivers/gpu/drm/omapdrm/omap_fbdev.c

@@ -131,9 +131,6 @@ static struct fb_ops omap_fb_ops = {
 	.fb_pan_display = omap_fbdev_pan_display,
 	.fb_blank = drm_fb_helper_blank,
 	.fb_setcmap = drm_fb_helper_setcmap,
-
-	.fb_debug_enter = drm_fb_helper_debug_enter,
-	.fb_debug_leave = drm_fb_helper_debug_leave,
 };
 
 static int omap_fbdev_create(struct drm_fb_helper *helper,