drm/gma500/psb_intel_display: Demote kernel-doc formatting abuse

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

 drivers/gpu/drm/gma500/psb_intel_display.c:79: warning: Function parameter or member 'dev' not described in 'psb_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/20210115181313.3431493-25-lee.jones@linaro.org

drivers/gpu/drm/gma500/psb_intel_display.c

@@ -71,7 +71,7 @@ static void psb_intel_clock(int refclk, struct gma_clock_t *clock)
 	clock->dot = clock->vco / clock->p;
 }
 
-/**
+/*
  * Return the pipe currently connected to the panel fitter,
  * or -1 if the panel fitter is not present or not in use
  */