drm/amd/pm/powerplay/hwmgr/process_pptables_v1_0: Provide description of 'call_back_func'

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

 drivers/gpu/drm/amd/amdgpu/../pm/powerplay/hwmgr/process_pptables_v1_0.c:1371: warning: Function parameter or member 'call_back_func' not described in 'get_powerplay_table_entry_v1_0'

Cc: Evan Quan <evan.quan@amd.com>
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/powerplay/hwmgr/process_pptables_v1_0.c

@@ -1362,6 +1362,7 @@ static int ppt_get_vce_state_table_entry_v1_0(struct pp_hwmgr *hwmgr, uint32_t i
  * @hwmgr: Pointer to the hardware manager.
  * @entry_index: The index of the entry to be extracted from the table.
  * @power_state: The address of the PowerState instance being created.
+ * @call_back_func: The function to call into to fill power state
  * Return: -1 if the entry cannot be retrieved.
  */
 int get_powerplay_table_entry_v1_0(struct pp_hwmgr *hwmgr,