drm/amd/powerplay: no pptable transfer and dpms enabled with "dpm=0"

Honor the 'dpm' module parameter setting on SW SMU routine as what
we did on previous ASICs. SMU FW loading is still proceeded even
with "dpm=0".
Signed-off-by: Evan Quan <evan.quan@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -1083,6 +1083,9 @@ static int smu_hw_init(void *handle)
 		}
 	}
 
+	if (!smu->pm_enabled)
+		return 0;
+
 	ret = smu_feature_init_dpm(smu);
 	if (ret)
 		goto failed;