drm/amd/pm/swsmu/smu12/renoir_ppt: Demote kernel-doc formatting abuse

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

Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: "Christian König" <christian.koenig@amd.com>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: amd-gfx@lists.freedesktop.org
Cc: dri-devel@lists.freedesktop.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/pm/swsmu/smu12/renoir_ppt.c

@@ -170,7 +170,7 @@ err0_out:
 	return -ENOMEM;
 }
 
-/**
+/*
  * This interface just for getting uclk ultimate freq and should't introduce
  * other likewise function result in overmuch callback.
  */
@@ -656,7 +656,7 @@ static int renoir_get_power(struct smu_context *smu, uint32_t *value)
 	return 0;
 }
 
-/**
+/*
  * This interface get dpm clock table for dc
  */
 static int renoir_get_dpm_clock_table(struct smu_context *smu, struct dpm_clocks *clock_table)