drm/vc4/vc4_v3d: Demote non-conformant kernel-doc headers

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

 drivers/gpu/drm/vc4/vc4_v3d.c:131: warning: Function parameter or member 'vc4' not described in 'vc4_v3d_pm_get'
 drivers/gpu/drm/vc4/vc4_v3d.c:231: warning: Function parameter or member 'vc4' not described in 'bin_bo_alloc'

Cc: Eric Anholt <eric@anholt.net>
Cc: Maxime Ripard <mripard@kernel.org>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Rob Clark <robdclark@gmail.com>
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/20201116174112.1833368-40-lee.jones@linaro.org

drivers/gpu/drm/vc4/vc4_v3d.c

@@ -122,7 +122,7 @@ static int vc4_v3d_debugfs_ident(struct seq_file *m, void *unused)
 	return 0;
 }
 
-/**
+/*
  * Wraps pm_runtime_get_sync() in a refcount, so that we can reliably
  * get the pm_runtime refcount to 0 in vc4_reset().
  */
@@ -205,7 +205,7 @@ int vc4_v3d_get_bin_slot(struct vc4_dev *vc4)
 	return -ENOMEM;
 }
 
-/**
+/*
  * bin_bo_alloc() - allocates the memory that will be used for
  * tile binning.
  *