drm: Remove crtc/connector->save/restore hooks

They're not how system suspend/resume should be done with atomic
(there's new helpers for that developed by Thierry Reding), and for
legacy drivers this really should be a helper hook and not a core one.

But there's not even helper code to use them, and only 2 drivers
(which now have their own private hooks) set them. Ditch them.

Saves me typing some kerneldoc, too ;-)

Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1449218769-16577-15-git-send-email-daniel.vetter@ffwll.ch
Reviewed-by: Thierry Reding <treding@nvidia.com>

include/drm/drm_crtc.h

@@ -320,8 +320,6 @@ struct drm_crtc_state {
 
 /**
  * struct drm_crtc_funcs - control CRTCs for a given device
- * @save: save CRTC state
- * @restore: restore CRTC state
  * @cursor_set: setup the cursor
  * @cursor_set2: setup the cursor with hotspot, superseeds @cursor_set if set
  * @cursor_move: move the cursor
@@ -339,11 +337,6 @@ struct drm_crtc_state {
  * bus accessors.
  */
 struct drm_crtc_funcs {
-	/* Save CRTC state */
-	void (*save)(struct drm_crtc *crtc); /* suspend? */
-	/* Restore CRTC state */
-	void (*restore)(struct drm_crtc *crtc); /* resume? */
-
 	/**
 	 * @reset:
 	 *
@@ -625,8 +618,6 @@ struct drm_connector_state {
 /**
  * struct drm_connector_funcs - control connectors on a given device
  * @dpms: set power state
- * @save: save connector state
- * @restore: restore connector state
  * @detect: is this connector active?
  * @fill_modes: fill mode list for this connector
  * @force: notify the driver that the connector is forced on
@@ -637,8 +628,6 @@ struct drm_connector_state {
  */
 struct drm_connector_funcs {
 	int (*dpms)(struct drm_connector *connector, int mode);
-	void (*save)(struct drm_connector *connector);
-	void (*restore)(struct drm_connector *connector);
 
 	/**
 	 * @reset: