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 <[email protected]>
Reviewed-by: Laurent Pinchart <[email protected]>
Reviewed-by: Linus Walleij <[email protected]>
Cc: Thierry Reding <[email protected]>
Cc: Laurent Pinchart <[email protected]>
Cc: Sam Ravnborg <[email protected]>
Cc: Maarten Lankhorst <[email protected]>
Cc: Maxime Ripard <[email protected]>
Cc: David Airlie <[email protected]>
Cc: Daniel Vetter <[email protected]>
Cc: Linus Walleij <[email protected]>
Cc: Jagan Teki <[email protected]>
Cc: Stefan Mavrodiev <[email protected]>
Cc: Robert Chiras <[email protected]>
Cc: "Guido Günther" <[email protected]>
Cc: Purism Kernel Team <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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