drm/amd/pm/powerplay/hwmgr/hardwaremanager: Fix function header related formatting issues

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

 drivers/gpu/drm/amd/amdgpu/../pm/powerplay/hwmgr/hardwaremanager.c:232: warning: Function parameter or member 'hwmgr' not described in 'phm_start_thermal_controller'
 drivers/gpu/drm/amd/amdgpu/../pm/powerplay/hwmgr/hardwaremanager.c:383: warning: Function parameter or member 'hwmgr' not described in 'phm_get_clock_info'
 drivers/gpu/drm/amd/amdgpu/../pm/powerplay/hwmgr/hardwaremanager.c:383: warning: Function parameter or member 'state' not described in 'phm_get_clock_info'
 drivers/gpu/drm/amd/amdgpu/../pm/powerplay/hwmgr/hardwaremanager.c:383: warning: Function parameter or member 'pclock_info' not described in 'phm_get_clock_info'
 drivers/gpu/drm/amd/amdgpu/../pm/powerplay/hwmgr/hardwaremanager.c:383: warning: Function parameter or member 'designation' not described in 'phm_get_clock_info'

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/hardwaremanager.c

@@ -223,11 +223,11 @@ int phm_register_irq_handlers(struct pp_hwmgr *hwmgr)
 }
 
 /**
-* Initializes the thermal controller subsystem.
-*
-* @param    pHwMgr  the address of the powerplay hardware manager.
-* @exception PP_Result_Failed if any of the paramters is NULL, otherwise the return value from the dispatcher.
-*/
+ * phm_start_thermal_controller - Initializes the thermal controller subsystem.
+ *
+ * @hwmgr:   the address of the powerplay hardware manager.
+ * Exception PP_Result_Failed if any of the paramters is NULL, otherwise the return value from the dispatcher.
+ */
 int phm_start_thermal_controller(struct pp_hwmgr *hwmgr)
 {
 	int ret = 0;
@@ -371,13 +371,14 @@ int phm_get_performance_level(struct pp_hwmgr *hwmgr, const struct pp_hw_power_s
 
 
 /**
-* Gets Clock Info.
-*
-* @param    pHwMgr  the address of the powerplay hardware manager.
-* @param    pPowerState the address of the Power State structure.
-* @param    pClockInfo the address of PP_ClockInfo structure where the result will be returned.
-* @exception PP_Result_Failed if any of the paramters is NULL, otherwise the return value from the back-end.
-*/
+ * phm_get_clock_info
+ *
+ * @hwmgr:  the address of the powerplay hardware manager.
+ * @state: the address of the Power State structure.
+ * @pclock_info: the address of PP_ClockInfo structure where the result will be returned.
+ * @designation: PHM performance level designation
+ * Exception PP_Result_Failed if any of the paramters is NULL, otherwise the return value from the back-end.
+ */
 int phm_get_clock_info(struct pp_hwmgr *hwmgr, const struct pp_hw_power_state *state, struct pp_clock_info *pclock_info,
 			PHM_PerformanceLevelDesignation designation)
 {