drm/panel: drop drm_device from drm_panel

The panel drivers used drm_panel.drm for two purposes:
1) Argument to drm_mode_duplicate()
2) drm->dev was used in error messages

The first usage is replaced with drm_connector.dev
- drm_connector is already connected to a drm_device
  and we have a valid connector

The second usage is replaced with drm_panel.dev
- this makes drivers more consistent in their dev argument
  used for dev_err() and friends

With these replacements there are no more uses of drm_panel.drm,
so it is removed from struct drm_panel.
With this change drm_panel_attach() and drm_panel_detach()
no longer have any use as they are empty functions.

v2:
  - editorial correction in changelog (Laurent)

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Cc: Thierry Reding <thierry.reding@gmail.com>
Cc: Laurent Pinchart <Laurent.pinchart@ideasonboard.com>
Cc: Sam Ravnborg <sam@ravnborg.org>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Maxime Ripard <mripard@kernel.org>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: Jagan Teki <jagan@amarulasolutions.com>
Cc: Stefan Mavrodiev <stefan@olimex.com>
Cc: Robert Chiras <robert.chiras@nxp.com>
Cc: "Guido Günther" <agx@sigxcpu.org>
Cc: Purism Kernel Team <kernel@puri.sm>
Link: https://patchwork.freedesktop.org/patch/msgid/20191207140353.23967-8-sam@ravnborg.org

drivers/gpu/drm/panel/panel-olimex-lcd-olinuxino.c

@@ -146,7 +146,6 @@ static int lcd_olinuxino_get_modes(struct drm_panel *panel,
 {
 	struct lcd_olinuxino *lcd = to_lcd_olinuxino(panel);
 	struct lcd_olinuxino_info *lcd_info = &lcd->eeprom.info;
-	struct drm_device *drm = lcd->panel.drm;
 	struct lcd_olinuxino_mode *lcd_mode;
 	struct drm_display_mode *mode;
 	u32 i, num = 0;
@@ -155,9 +154,9 @@ static int lcd_olinuxino_get_modes(struct drm_panel *panel,
 		lcd_mode = (struct lcd_olinuxino_mode *)
 			   &lcd->eeprom.reserved[i * sizeof(*lcd_mode)];
 
-		mode = drm_mode_create(drm);
+		mode = drm_mode_create(connector->dev);
 		if (!mode) {
-			dev_err(drm->dev, "failed to add mode %ux%u@%u\n",
+			dev_err(panel->dev, "failed to add mode %ux%u@%u\n",
 				lcd_mode->hactive,
 				lcd_mode->vactive,
 				lcd_mode->refresh);