drm/gma500/cdv_intel_display: Demote kernel-doc abuse in 'cdv_intel_panel_fitter_pipe()'s header

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

 drivers/gpu/drm/gma500/cdv_intel_display.c:559: warning: Function parameter or member 'dev' not described in 'cdv_intel_panel_fitter_pipe'

Cc: Patrik Jakobsson <patrik.r.jakobsson@gmail.com>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Eric Anholt <eric@anholt.net>
Cc: dri-devel@lists.freedesktop.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20210115181601.3432599-16-lee.jones@linaro.org

drivers/gpu/drm/gma500/cdv_intel_display.c

@@ -551,7 +551,7 @@ void cdv_update_wm(struct drm_device *dev, struct drm_crtc *crtc)
 	}
 }
 
-/**
+/*
  * Return the pipe currently connected to the panel fitter,
  * or -1 if the panel fitter is not present or not in use
  */