drm/gma500: Move to private save/restore hooks

I want to remove the core ones since with atomic drivers system
suspend/resume is solved much differently. And there's only 2 drivers
(nouveau besides gma500) really using them.

v2: Fixup build noise 0day reported.

Cc: Patrik Jakobsson <patrik.r.jakobsson@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1449218769-16577-13-git-send-email-daniel.vetter@ffwll.ch
Reviewed-by: Thierry Reding <treding@nvidia.com> (v1)

drivers/gpu/drm/vmwgfx/vmwgfx_scrn.c

@@ -563,8 +563,6 @@ static void vmw_sou_connector_destroy(struct drm_connector *connector)
 
 static struct drm_connector_funcs vmw_sou_connector_funcs = {
 	.dpms = vmw_du_connector_dpms,
-	.detect = vmw_du_connector_detect,
-	.fill_modes = vmw_du_connector_fill_modes,
 	.set_property = vmw_du_connector_set_property,
 	.destroy = vmw_sou_connector_destroy,
 };