drm/amdkfd: enable renoir while device probes

This patch is to add asic flag to enable device probe during kfd init.

Signed-off-by: Huang Rui <ray.huang@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>