drm/amdgpu: add GFX_CP_LS flag to Arcturus

Missed AMD_CG_SUPPORT_GFX_CP_LS accidently when commit patch before
    drm/amdgpu: enable gfx clock gating for Arcturus
Signed-off-by: Le Ma <le.ma@amd.com>
Reviewed-by: Kevin Wang <kevin1.wang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/soc15.c

@@ -1123,6 +1123,7 @@ static int soc15_common_early_init(void *handle)
 			AMD_CG_SUPPORT_GFX_MGLS |
 			AMD_CG_SUPPORT_GFX_CGCG |
 			AMD_CG_SUPPORT_GFX_CGLS |
+			AMD_CG_SUPPORT_GFX_CP_LS |
 			AMD_CG_SUPPORT_HDP_MGCG |
 			AMD_CG_SUPPORT_HDP_LS |
 			AMD_CG_SUPPORT_SDMA_MGCG |