drm/amdgpu: fix ras supported check

Fix aldebaran ras supported check on SRIOV guest side,
the previous check conditicon block all ras feature
on baremetal

Signed-off-by: Stanley.Yang <Stanley.Yang@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>