drm/amd/pm: drop unneeded hwmgr->smu_lock

As all those related APIs are already well protected by adev->pm.mutex.
Signed-off-by: Evan Quan <evan.quan@amd.com>
Reviewed-by: Guchun Chen <guchun.chen@amd.com>
Reviewed-by: Lijo Lazar <lijo.lazar@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/pm/powerplay/inc/hwmgr.h

@@ -748,7 +748,6 @@ struct pp_hwmgr {
 	bool not_vf;
 	bool pm_en;
 	bool pp_one_vf;
-	struct mutex smu_lock;
 	struct mutex msg_lock;
 
 	uint32_t pp_table_version;