drm/amdgpu: disable coarse grain clockgating for ST

The CGCG feature  on Stoney is causing GFX related
issues such as freezes and blank outs.

Signed-off-by: Shirish S <shirish.s@amd.com>
Reviewed-by: Arindam Nath <arindam.nath@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/vi.c

@@ -1022,7 +1022,6 @@ static int vi_common_early_init(void *handle)
 			AMD_CG_SUPPORT_GFX_CP_LS |
 			AMD_CG_SUPPORT_GFX_CGTS |
 			AMD_CG_SUPPORT_GFX_CGTS_LS |
-			AMD_CG_SUPPORT_GFX_CGCG |
 			AMD_CG_SUPPORT_GFX_CGLS |
 			AMD_CG_SUPPORT_BIF_LS |
 			AMD_CG_SUPPORT_HDP_MGCG |