drm/amd/powerplay/tonga: disable vce pg

Not working reliably yet.
Reviewed-by: Eric Huang <JinHuiEric.Huang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/powerplay/hwmgr/tonga_hwmgr.c

@@ -4617,6 +4617,8 @@ int tonga_hwmgr_backend_init(struct pp_hwmgr *hwmgr)
 
 	phm_cap_unset(hwmgr->platform_descriptor.platformCaps,
 		      PHM_PlatformCaps_UVDPowerGating);
+	phm_cap_unset(hwmgr->platform_descriptor.platformCaps,
+		      PHM_PlatformCaps_VCEPowerGating);
 
 	if (0 == result) {
 		struct cgs_system_info sys_info = {0};