drm/amd/pm/powerplay/hwmgr/vega12_thermal: Provide function name

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

 drivers/gpu/drm/amd/amdgpu/../pm/powerplay/hwmgr/vega12_thermal.c:171: warning: expecting prototype for Set the requested temperature range for high and low alert signals(). Prototype was for vega12_thermal_set_temperature_range() instead

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/vega12_thermal.c

@@ -159,7 +159,8 @@ int vega12_thermal_get_temperature(struct pp_hwmgr *hwmgr)
 }
 
 /**
- * Set the requested temperature range for high and low alert signals
+ * vega12_thermal_set_temperature_range - Set the requested temperature range
+ *                                        for high and low alert signals
  *
  * @hwmgr: The address of the hardware manager.
  * @range: Temperature range to be programmed for