drm/amd/powerplay: check gfxclk dpm enablement before proceeding

Support gfxclk dpm disablement.
Signed-off-by: Evan Quan <evan.quan@amd.com>
Reviewed-by: Feifei Xu <Feifei.Xu@amd.com>
Reviewed-by: Kevin Wang <kevin1.wang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -143,6 +143,7 @@ int smu_get_dpm_freq_range(struct smu_context *smu, enum smu_clk_type clk_type,
 		}
 		break;
 	case SMU_GFXCLK:
+	case SMU_SCLK:
 		if (!smu_feature_is_enabled(smu, SMU_FEATURE_DPM_GFXCLK_BIT)) {
 			pr_warn("gfxclk dpm is not enabled\n");
 			return 0;