drm/amd/pp: Fix gfx ring test failed on Fiji without hw avfs support

caused by
'commit ca82cec868d1 ("drm/amd/pp: Simplified the avfs btc state on smu7")'
Reviewed-by: NAlex Deucher <alexander.deucher@amd.com>
Signed-off-by: NRex Zhu <Rex.Zhu@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/powerplay/smumgr/fiji_smumgr.c

@@ -263,6 +263,9 @@ static int fiji_setup_graphics_level_structure(struct pp_hwmgr *hwmgr)
 
 static int fiji_avfs_event_mgr(struct pp_hwmgr *hwmgr)
 {
+	if (!hwmgr->avfs_supported)
+		return 0;
+
 	PP_ASSERT_WITH_CODE(0 == fiji_setup_graphics_level_structure(hwmgr),
 			"[AVFS][fiji_avfs_event_mgr] Could not Copy Graphics Level"
 			" table over to SMU",

drivers/gpu/drm/amd/powerplay/smumgr/polaris10_smumgr.c

@@ -172,11 +172,13 @@ static int polaris10_setup_graphics_level_structure(struct pp_hwmgr *hwmgr)
 }
 
 
-static int
-polaris10_avfs_event_mgr(struct pp_hwmgr *hwmgr)
+static int polaris10_avfs_event_mgr(struct pp_hwmgr *hwmgr)
 {
 	struct smu7_smumgr *smu_data = (struct smu7_smumgr *)(hwmgr->smu_backend);
 
+	if (!hwmgr->avfs_supported)
+		return 0;
+
 	PP_ASSERT_WITH_CODE(0 == polaris10_setup_graphics_level_structure(hwmgr),
 		"[AVFS][Polaris10_AVFSEventMgr] Could not Copy Graphics Level table over to SMU",
 		return -EINVAL);