v1:
the dceflck sysnode is not aviable on GFX v9.4.3 chip.

v2:
simplify code logic using helper function: amdgpu_device_has_display_hardware().
Signed-off-by: Yang Wang <kevinyang.wang@amd.com>
Reviewed-by: Kenneth Feng <kenneth.feng@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>