drm/amd/powerplay: Fix potential NULL pointer issue

If doesn't enable dpm, the powerplay will not allocate memory for
hw management. So, hw_init_power_state_table function will reference
NULL pointer when resetting.

Signed-off-by: Xiangliang Yu <[e-mail]>
Reviewed-by: Rex Zhu <[e-mail]>
Reviewed-by: Alex Deucher <[e-mail]>
Acked-by: Christian König <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>
Cc: [e-mail]

drivers/gpu/drm/amd/powerplay/amd_powerplay.c

···
 	if (ret)
 		return ret;
 
-	hw_init_power_state_table(instance->hwmgr);
-
 	if ((amdgpu_dpm == 0)
 		|| cgs_is_virtualization_enabled(instance->smu_mgr->device))
 		return 0;
+
+	hw_init_power_state_table(instance->hwmgr);
 
 	if (eventmgr == NULL || eventmgr->pp_eventmgr_init == NULL)
 		return -EINVAL;