drm/amdgpu: Ignore the not supported error from psp

As the VCN firmware will not use
vf vmr now. And new psp policy won't support set tmr
now.
For driver compatible issue, ignore the not support error.

Signed-off-by: Emily Deng <Emily.Deng@amd.com>
Reviewed-by: Monk Liu <monk.liu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>