drm/panel: panel-simple: Fix 'struct panel_desc's header

Struct headers should start with 'struct <name>'

Fixes the following W=1 kernel build warning(s):

drivers/gpu/drm/panel/panel-simple.c:42: warning: Cannot understand * @modes: Pointer to array of fixed modes appropriate for this panel. If

Cc: Thierry Reding <[e-mail]>
Cc: Sam Ravnborg <[e-mail]>
Cc: David Airlie <[e-mail]>
Cc: Daniel Vetter <[e-mail]>
Cc: [e-mail]
Signed-off-by: Lee Jones <[e-mail]>
Acked-by: Thierry Reding <[e-mail]>
Signed-off-by: Sam Ravnborg <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/gpu/drm/panel/panel-simple.c

···
 #include <drm/drm_panel.h>
 
 /**
+ * struct panel_desc
  * @modes: Pointer to array of fixed modes appropriate for this panel.  If
  *         only one mode then this can just be the address of this the mode.
  *         NOTE: cannot be used with "timings" and also if this is specified
···
  * @delay: Structure containing various delay values for this panel.
  * @bus_format: See MEDIA_BUS_FMT_... defines.
  * @bus_flags: See DRM_BUS_FLAG_... defines.
+ * @connector_type: LVDS, eDP, DSI, DPI, etc.
  */
 struct panel_desc {
 	const struct drm_display_mode *modes;